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Effect of Nature of Surface on Friction

what is 1. fo...

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what is 1. force 2. centripetal force 3. centrifugal force 4. inertia 5. momentum 6. newton first,second &third law of motion 7.impulse 8. law of conservation of momentum 9. equilibrium of concurrent forces 10. friction 11.law of friction 12.rolling friction 13. static friction 14. kinetic friction.

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Q. Assertion :A disk is rolling on the rough ground under the application of some external force is performing pure rolling, then friction force (if acting) acts as a conservative force. Reason: Kinetic friction force is sometimes nondissipative.

Q. State whether true or false.

The force of friction that acts as the centripetal force when a car moves in a circle is kinetic friction.

Q. Which of the following statements regarding laws governing the friction between dry surfaces are correct?

1. The friction force is dependent on the velocity sliding.
2. The friction force is directly proportional to the normal force.
3. The friction force is dependent on the materials of the contact surfaces.
4.The friction force is independent of the area of contact

Select the correct answer using the codes given below

Why does static friction require highest amount of force compared to rolling or sliding friction

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