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Why does a spinning object speed up as it shrinks? This Hoberman sphere demonstration illustrates the law of conservation of angular momentum. Moment of inertia measures how mass is distributed relative to the axis of rotation. When the sphere collapses, its mass moves inward. This decrease in inertia forces... show more

The Scientific Lens

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16,700 views • 4 months ago •via X (Twitter)

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Prandtl Rotations describe the motion of a gyroscope's rotor around its principal axes. A gyroscope's main behavior is governed by the principles of angular momentum conservation, causing it to resist changes to its orientation. For a rotating gyroscope, stability along its axes is critical. Depending on the external influences (like additional weights, torques, or friction), these rotations can either remain stable (maintaining a steady motion) or become unstable, leading to wobbling or tumbling motions. When rotating about one of its principal axes (with the highest or lowest moment of inertia), the gyroscope exhibits stable behavior. If additional forces or masses alter its inertia, the gyroscope may cross a critical stability threshold, leading to unstable rotations. [1] .

Prandtl Rotations describe the motion of a gyroscope's rotor around its principal axes. A gyroscope's main behavior is governed by the principles of angular momentum conservation, causing it to resist changes to its orientation. For a rotating gyroscope, stability along its axes is critical. Depending on the external influences (like additional weights, torques, or friction), these rotations can either remain stable (maintaining a steady motion) or become unstable, leading to wobbling or tumbling motions. When rotating about one of its principal axes (with the highest or lowest moment of inertia), the gyroscope exhibits stable behavior. If additional forces or masses alter its inertia, the gyroscope may cross a critical stability threshold, leading to unstable rotations. [1] .

Craig Stone

464,952 views • 1 year ago

«Physics works» Provided the initial speed of the weight is zero, the conservation of momentum will allow the ball to touch the girl's face, and not crush it. 0th Newton's law: don't move. [📹 spider_slack]

«Physics works» Provided the initial speed of the weight is zero, the conservation of momentum will allow the ball to touch the girl's face, and not crush it. 0th Newton's law: don't move. [📹 spider_slack]

Massimo

4,927,950 views • 2 years ago

A cheetah hitting a sharp turn at high speed should logically skid out, but it doesn't. The secret is the tail. This muscular rudder acts as a high-speed stabilizer. By whipping it in the opposite direction of a turn, the cheetah creates counter-torque to balance its center of mass. This allows for rapid pivots while semi-retractable claws provide permanent, spike boots-like traction. It’s pure biomechanics using physics to manage angular momentum. While we build supercars with active spoilers, nature perfected this steering millions of years ago. VC: Lemurt Wildlife #wildlife #nature #predator #cheetah #biomechanics

A cheetah hitting a sharp turn at high speed should logically skid out, but it doesn't. The secret is the tail. This muscular rudder acts as a high-speed stabilizer. By whipping it in the opposite direction of a turn, the cheetah creates counter-torque to balance its center of mass. This allows for rapid pivots while semi-retractable claws provide permanent, spike boots-like traction. It’s pure biomechanics using physics to manage angular momentum. While we build supercars with active spoilers, nature perfected this steering millions of years ago. VC: Lemurt Wildlife #wildlife #nature #predator #cheetah #biomechanics

Dr. PM Dhakate

58,609 views • 4 months ago

Good example of how getting stronger isn't just about adding quality mass to generate more momentum. The strength to decelerate proximal segments (pelvis rotation, trunk flexion, trunk rotation), allows for improved energy/momentum transfer into the arm. Here's a visual I've used before that applies to Misiorowski's HS > Pro transformation. When the pelvis doesn't stick, the trunk can't fully accelerate. When the trunk doesn't stick, the arm can't fully accelerate. Lower body strength/mass improves velocity through the mass component of the physics equation, but it also provides the ability to effectively decelerate so you can "crack the whip," send energy proximal to distal and create insane arm speeds.

Good example of how getting stronger isn't just about adding quality mass to generate more momentum. The strength to decelerate proximal segments (pelvis rotation, trunk flexion, trunk rotation), allows for improved energy/momentum transfer into the arm. Here's a visual I've used before that applies to Misiorowski's HS > Pro transformation. When the pelvis doesn't stick, the trunk can't fully accelerate. When the trunk doesn't stick, the arm can't fully accelerate. Lower body strength/mass improves velocity through the mass component of the physics equation, but it also provides the ability to effectively decelerate so you can "crack the whip," send energy proximal to distal and create insane arm speeds.

Ben Brewster

102,084 views • 3 months ago

Astronaut Tim Peake demonstrates aboard the International Space Station, a stationary object in microgravity will tumble aimlessly with even the slightest tap. But once a gyroscope begins to spin, it instantly locks into a rigid geometric plane, stubbornly refusing to be tilted. This phenomenon is driven by angular momentum. The rapid rotation creates a powerful resistance to outside forces, granting the object an invisible, unyielding stability. This is far more than a simple physics trick. This exact principle of spin stabilization is what keeps the massive space station perfectly oriented as it orbits the Earth; a profound reminder that in the chaotic vacuum of space, sometimes the only way to stay perfectly still is to keep moving.

Astronaut Tim Peake demonstrates aboard the International Space Station, a stationary object in microgravity will tumble aimlessly with even the slightest tap. But once a gyroscope begins to spin, it instantly locks into a rigid geometric plane, stubbornly refusing to be tilted. This phenomenon is driven by angular momentum. The rapid rotation creates a powerful resistance to outside forces, granting the object an invisible, unyielding stability. This is far more than a simple physics trick. This exact principle of spin stabilization is what keeps the massive space station perfectly oriented as it orbits the Earth; a profound reminder that in the chaotic vacuum of space, sometimes the only way to stay perfectly still is to keep moving.

Cosmos Archive

507,845 views • 4 months ago

Canada is a country that is governed by the rule of law, and the protection of all citizens & the defence of our sovereignty are fundamental to our society. During this time, let us remain united and allow the justice system to proceed as it must.

Canada is a country that is governed by the rule of law, and the protection of all citizens & the defence of our sovereignty are fundamental to our society. During this time, let us remain united and allow the justice system to proceed as it must.

Anita Anand

47,624 views • 2 years ago

"Moving forward while staying back" This makes zero sense at first glance, but is ultimately what needs to happen to generate maximum velocity. ✅We need the linear momentum of the stride. ✅We must find a way to convert as much of this into usable rotation (angular momentum) as possible. ✅We must do this on one leg. The most efficient throwers do this by spring-loading tension into the ground/back hip complex and holding that tension while building linear momentum down the slope.

"Moving forward while staying back" This makes zero sense at first glance, but is ultimately what needs to happen to generate maximum velocity. ✅We need the linear momentum of the stride. ✅We must find a way to convert as much of this into usable rotation (angular momentum) as possible. ✅We must do this on one leg. The most efficient throwers do this by spring-loading tension into the ground/back hip complex and holding that tension while building linear momentum down the slope.

Ben Brewster

11,149 views • 9 months ago

NASA astronaut demonstrating the Dzhanibekov effect. An astronaut noticed this physical behavior of a handle, that turned out to be the proof of a theorem: the tennis racket theorem (also dubbed the Dzhanibekov effect) The Tennis Racket Theorem states that an object with three unique moments of inertia, rotation about the axis of intermediate moment of inertia is unstable, while rotation about the other two axis is stable. The effect is named after the Russian cosmonaut Vladimir Dzhanibekov who discovered this phenomenon while in space in 1985.

NASA astronaut demonstrating the Dzhanibekov effect. An astronaut noticed this physical behavior of a handle, that turned out to be the proof of a theorem: the tennis racket theorem (also dubbed the Dzhanibekov effect) The Tennis Racket Theorem states that an object with three unique moments of inertia, rotation about the axis of intermediate moment of inertia is unstable, while rotation about the other two axis is stable. The effect is named after the Russian cosmonaut Vladimir Dzhanibekov who discovered this phenomenon while in space in 1985.

Historic Vids

23,749,999 views • 2 years ago

Hip rotation is one of the primary drivers of velocity during the throw. Both speed and timing of rotation matter. The goal is to have the hips rotate out in front of the torso. Ideally, you want rotation to begin quickly after the front foot strikes the ground. The speed of rotation is also critical. I strive for all QBs that I work with to be 800+ deg/sec with hip rotation speed. One key thing is to not mistake “sliding” for rotating. Many will push and slide their hips forward as opposed to rotating against a stable lead leg.

Hip rotation is one of the primary drivers of velocity during the throw. Both speed and timing of rotation matter. The goal is to have the hips rotate out in front of the torso. Ideally, you want rotation to begin quickly after the front foot strikes the ground. The speed of rotation is also critical. I strive for all QBs that I work with to be 800+ deg/sec with hip rotation speed. One key thing is to not mistake “sliding” for rotating. Many will push and slide their hips forward as opposed to rotating against a stable lead leg.

Joe Mohr

12,648 views • 3 months ago

It's easier to explain why the moon shouldn't exist than why it does. All theories of lunar origin don't make sense. The moon's mass and assumed density suggest it should have settled into spherical form... with a single center of mass. Free to rotate on any axis. But the moon's rotation is completely and precisely locked to its orbital period around Earth. This implies mass is not distributed radially symmetrical. A huge anomaly. Something within the lunar crust is extremely rigid.

It's easier to explain why the moon shouldn't exist than why it does. All theories of lunar origin don't make sense. The moon's mass and assumed density suggest it should have settled into spherical form... with a single center of mass. Free to rotate on any axis. But the moon's rotation is completely and precisely locked to its orbital period around Earth. This implies mass is not distributed radially symmetrical. A huge anomaly. Something within the lunar crust is extremely rigid.

Randall Carlson

29,758 views • 7 months ago

🔩 An unexpected twist in space The Dzhanibekov effect: an object rotating in zero gravity suddenly flips its axis of rotation. This occurs due to differences in the moments of inertia across the three axes, causing rotational instability. Demonstrated by Vladimir Dzhanibekov in 1985, this phenomenon shows how even a simple nut behaves unpredictably in orbit. 🤔

🔩 An unexpected twist in space The Dzhanibekov effect: an object rotating in zero gravity suddenly flips its axis of rotation. This occurs due to differences in the moments of inertia across the three axes, causing rotational instability. Demonstrated by Vladimir Dzhanibekov in 1985, this phenomenon shows how even a simple nut behaves unpredictably in orbit. 🤔

Black Hole

40,870 views • 1 month ago

Physics feels stable, predictable, and well-behaved largely because we learned it in 3D. That comfort hides a trap. In 1907, Paul Ehrenfest pointed out something unsettling. If you take the laws we treat as fundamental and transplant them into a different number of spatial dimensions, they often stop working the way we expect. Not just numerically different but qualitatively different. The issue isn’t the force law by itself but it's geometry. Gauss’s law ties inverse-square forces to the surface area of spheres, and sphere geometry depends on dimension. Change the dimension, and the same-looking force produces a different potential, a different balance of attraction and inertia, and a different fate for motion.

Physics feels stable, predictable, and well-behaved largely because we learned it in 3D. That comfort hides a trap. In 1907, Paul Ehrenfest pointed out something unsettling. If you take the laws we treat as fundamental and transplant them into a different number of spatial dimensions, they often stop working the way we expect. Not just numerically different but qualitatively different. The issue isn’t the force law by itself but it's geometry. Gauss’s law ties inverse-square forces to the surface area of spheres, and sphere geometry depends on dimension. Change the dimension, and the same-looking force produces a different potential, a different balance of attraction and inertia, and a different fate for motion.

Mathelirium

30,521 views • 5 months ago

This video is controversial but I’d like to explore its physics in this thread As I see it the potential energy of the nails convert to kinetic energy so it transfers energy all through the box the entropy of the system is increased 1/🧵

This video is controversial but I’d like to explore its physics in this thread As I see it the potential energy of the nails convert to kinetic energy so it transfers energy all through the box the entropy of the system is increased 1/🧵

Science girl

17,380,621 views • 3 years ago

String Theory is one of the few frameworks that tries to describe Quantum Physics and Gravity in the same mathematical language. In this animation, the glowing loop is the string, the shifting color along it represent its quantum vibration modes, and the surrounding fabric is a proxy for Spacetime responding. When you quantize a string, one of its vibration modes behaves like a graviton. So, geometry shows up as part of the same quantum system. #StringTheory #QuantumGravity #GeneralRelativity #QuantumPhysics #TheoreticalPhysics #PhysicsVisualization

String Theory is one of the few frameworks that tries to describe Quantum Physics and Gravity in the same mathematical language. In this animation, the glowing loop is the string, the shifting color along it represent its quantum vibration modes, and the surrounding fabric is a proxy for Spacetime responding. When you quantize a string, one of its vibration modes behaves like a graviton. So, geometry shows up as part of the same quantum system. #StringTheory #QuantumGravity #GeneralRelativity #QuantumPhysics #TheoreticalPhysics #PhysicsVisualization

Mathelirium

42,172 views • 5 months ago

The fastest star in the Galaxy is S4714, which accelerates to approximately 24,000 km/s at its peak, or about 8% the speed of light. It orbits the supermassive black hole Sagittarius A* at the center of our Milky Way, moving in an extremely eccentric orbit. At its closest approach, it comes to a distance of approximately 1.8 billion km from the black hole—comparable to the distance from the Sun to Saturn. From this distance, the angular size of the "shadow" of Sagittarius A* is four times larger than the angular size of the Sun in Earth's sky! Observations of S4714, conducted with the European Southern Observatory, are helping to test the effects of general relativity in the extreme gravity of the Galactic center.

The fastest star in the Galaxy is S4714, which accelerates to approximately 24,000 km/s at its peak, or about 8% the speed of light. It orbits the supermassive black hole Sagittarius A* at the center of our Milky Way, moving in an extremely eccentric orbit. At its closest approach, it comes to a distance of approximately 1.8 billion km from the black hole—comparable to the distance from the Sun to Saturn. From this distance, the angular size of the "shadow" of Sagittarius A* is four times larger than the angular size of the Sun in Earth's sky! Observations of S4714, conducted with the European Southern Observatory, are helping to test the effects of general relativity in the extreme gravity of the Galactic center.

Black Hole

15,392 views • 5 months ago

🧵 I watched the 1974 Land of the Lost when I was a kid, but I only understood the basics of it, on the surface it seemed like a silly children’s show. I had no understanding of the deep physics involved. This frankly blew me away. The scene in this thread explains the Law of Conservation of Mass in a closed system, Schrödinger’s Box theory, as well as Hawking Radiation and particles at the event horizon of a black hole, one set escaping, one being sacrificed.

🧵 I watched the 1974 Land of the Lost when I was a kid, but I only understood the basics of it, on the surface it seemed like a silly children’s show. I had no understanding of the deep physics involved. This frankly blew me away. The scene in this thread explains the Law of Conservation of Mass in a closed system, Schrödinger’s Box theory, as well as Hawking Radiation and particles at the event horizon of a black hole, one set escaping, one being sacrificed.

JenOakie42💫

326,459 views • 1 year ago

The moment when the House of Commons voted unanimously to call on the federal government to declare #MMIWG2S a Canada-wide emergency and implement a Red Dress Alert system. This government must speed up their delivery of resources and funding to stop this violence. #cdnpoli

The moment when the House of Commons voted unanimously to call on the federal government to declare #MMIWG2S a Canada-wide emergency and implement a Red Dress Alert system. This government must speed up their delivery of resources and funding to stop this violence. #cdnpoli

Leah ProudLakota (she/her)

115,342 views • 3 years ago

Ever hear Albert Einstein’s voice? He’s him explaining his formula, E=mc² It is probably the most famous formula in the world, but what exactly does it mean? Let's start by defining each letter in the formula: E = Energy M = Mass C = Speed of light (a very large number) If we were to read the formula, we would say, "Energy equals mass times the speed of light squared." The formula itself is rather simple in that it essentially says that energy and mass are different forms of the same thing; they are interchangeable. So are you saying a beam of light and a banana are different forms of the same thing? Yes, in our head, this may not make sense, but it does in nature. This discovery was groundbreaking at the time because people had previously believed that energy could only be created by kinetic or potential energy. You can increase kinetic energy by accelerating your car. You can increase potential energy by stretching a rubber band. Einstein demonstrated that there was a third form, which is that things have energy because they simply exist. Ok, so why is mass multiplied by the speed of light? Whenever you are converting mass to pure energy, it is by nature moving at the speed of light. Pure energy is an electromagnetic radiation, which travels at 186,000 miles/sec (300,000 km/sec). Ok, cool, but why is the speed of light squared? This again has to do with the nature of energy. If an object is moving twice as fast as another object, it does not have twice as much energy. Rather, it has four times as much energy. Hence, the speed of light is squared, which comes out to a very big number. C^2 is the conversion factor from mass to energy. The bottom line is that even small objects have an immense amount of energy. Through the process of nuclear fusion/fission via nuclear power plants, we can harness some of this energy. In the atomic bomb that destroyed the city of Hiroshima, there was about 700 milligrams (equivalent to the weight of 1/3 of a dime) of uranium which was converted to energy that destroyed everything within a 1-mile (1.6 km) blast radius.

Ever hear Albert Einstein’s voice? He’s him explaining his formula, E=mc² It is probably the most famous formula in the world, but what exactly does it mean? Let's start by defining each letter in the formula: E = Energy M = Mass C = Speed of light (a very large number) If we were to read the formula, we would say, "Energy equals mass times the speed of light squared." The formula itself is rather simple in that it essentially says that energy and mass are different forms of the same thing; they are interchangeable. So are you saying a beam of light and a banana are different forms of the same thing? Yes, in our head, this may not make sense, but it does in nature. This discovery was groundbreaking at the time because people had previously believed that energy could only be created by kinetic or potential energy. You can increase kinetic energy by accelerating your car. You can increase potential energy by stretching a rubber band. Einstein demonstrated that there was a third form, which is that things have energy because they simply exist. Ok, so why is mass multiplied by the speed of light? Whenever you are converting mass to pure energy, it is by nature moving at the speed of light. Pure energy is an electromagnetic radiation, which travels at 186,000 miles/sec (300,000 km/sec). Ok, cool, but why is the speed of light squared? This again has to do with the nature of energy. If an object is moving twice as fast as another object, it does not have twice as much energy. Rather, it has four times as much energy. Hence, the speed of light is squared, which comes out to a very big number. C^2 is the conversion factor from mass to energy. The bottom line is that even small objects have an immense amount of energy. Through the process of nuclear fusion/fission via nuclear power plants, we can harness some of this energy. In the atomic bomb that destroyed the city of Hiroshima, there was about 700 milligrams (equivalent to the weight of 1/3 of a dime) of uranium which was converted to energy that destroyed everything within a 1-mile (1.6 km) blast radius.

Historic Vids

2,424,303 views • 3 years ago