Why Doesn’t a Spinning Gyroscope Simply Fall Over?

Why Doesn’t a Spinning Gyroscope Simply Fall Over?

Foundational Physics Short Answer: A spinning gyroscope supported at one end does not always tip straight down because gravity’s torque changes the direction of its angular momentum. With a fast spin and suitable conditions, the axle turns sideways around the support...
Why Is Angular Momentum Conserved?

Why Is Angular Momentum Conserved?

Foundational Physics Short Answer: Angular momentum stays constant when the net external torque on a system is zero. Forces within the system can change how its parts rotate, but they exchange angular momentum rather than create or destroy the total. A torque from...
Why Does Pulling Your Arms In Make You Spin Faster?

Why Does Pulling Your Arms In Make You Spin Faster?

Foundational Physics Short Answer: Pulling your arms toward your body moves mass closer to the axis of rotation, reducing your moment of inertia. If outside twisting forces are negligible, angular momentum stays constant, so you spin faster. Your muscles also do work...
Why Does Torque Depend on Perpendicular Distance?

Why Does Torque Depend on Perpendicular Distance?

Foundational Physics Short Answer: Torque depends on perpendicular distance because only the part of a force that acts to turn an object about a pivot produces torque. The turning effect is determined by the shortest distance from the pivot to the force’s line of...