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Friction


Videos

1. Angle of Repose, Angle of Friction

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A block initially rests on a horizontal rough plank. As the plank is slowly raised at one end, the block begins to slide down at a certain minimum inclination. How can we find the coefficient of fr0iction from such experiment? When one block is just about to slide on another, what is the angle between the normal force and the total contact force? How is this angle related to the friction coefficient? The video lecture “Angle of Repose and Angle of Friction” answers some of these questions, and more.


2. Rolling Friction


3. Static and Kinetic Friction

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Although problems on physics are sometimes made simpler by assuming frictionless surfaces, most real-life problems must include the force of friction. Friction comes into play whenever there is any attempted or real relative motion between two surfaces. Does friction always oppose motion, or can it facilitate motion too? What are static, limiting and kinetic friction? Which empirical laws dictate their values? Can the coefficients of friction be greater than 1? The video lecture “Static and Kinetic Friction” answers some of these questions, and more.


4. Examples of Motion on Rough Surfaces I

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Most motions around us happen on rough surfaces. If a body is released on the floor with a certain initial velocity, when and where will it come to a stop? Why is pushing a box more difficult than pulling? On what logic can a block ‘stick to’ an accelerated vertical wall? Suppose a pair of rough blocks are placed  one on top of the other  on a smooth floor. If force is applied to either block, will the blocks move together or separately? The video lecture “Examples of Motion on Rough Surfaces” answers some of these questions, and more.


5. Examples of Motion on Rough Surfaces II

6. Examples of Motion on Rough Surfaces III

7. Problems of Motion on Rough Surfaces I

8. Problems of Motion on Rough Surfaces II

9. Problems of Motion on Rough Surfaces III

10. Drag Force

11. Problems on Drag Force