Rolling, Toppling and Spinning Collisions: Worked Cases… | StemPy Lab
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“Rolling, Toppling and Spinning Collisions: Worked Cases and Hard Problems” is available to Standard subscribers.
A bowling ball skids and then rolls. A bullet strikes a hinged door. A tall cupboard topples before it slides. This course takes rolling, angular momentum and statics to the harder level: which way the friction acts and when slipping stops, a wheel climbing a step, collisions with rods and discs, toppling, and the moment of inertia of built-up bodies. The problems are at the level of JEE Advanced, A-Level Physics and IB Higher Level, with a full timed paper.
3Lessons12Problems2Python Labs1Question Set1Mock Test
Slipping, friction and the move to rolling: A bowling ball skids first and rolls later. This lesson follows the skid. We find how long it lasts and how fast the ball moves when it ends. We find which way the friction acts. We also find how rough a slope must be for a body to roll down it without slipping.
Angular momentum about a chosen point, impulses and steps: A hinge, a floor or a step gives an unknown force, and angular momentum lets us leave that force out. This lesson chooses the point for the angular momentum to match the problem. Then it solves a bullet in a hinged rod, a blow on a free rod, a ball hitting a rod and a wheel meeting a step.
Toppling, statics and built-up bodies: A tall cupboard topples before it slides. A ladder carries a person up to a height and then slips. A plate with a hole turns differently from a plate without one. This lesson uses torque to decide what happens first, and it builds the moment of inertia of a body from its parts.