Question

An object placed on a horizontal surface was given a push. It moved some distance and then it stopped. At what time was friction acting on the object? 1. the moment the object was pushed 2. when the object was moving 3. when it was finally in a resting position. A. only 2 B. only 1 and 2 C. only 2 and 3 D. all - 1, 2, and 3

Answer 1

Answer:

I mean it is all

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Answer 2

In all the conditions friction force acts on the object ( option-D).

• The friction force is a contact force that acts between the contacting surfaces.
• Therefore, friction force will act in every situation as the object is in contact with the surface all the time.
• Different types of frictional force act at different time periods.
• For instance when an object is at rest or pushed when at rest, a static frictional force acts on the object.
• And when an object is in motion, then sliding frictional force acts on it.
• In situations 1, and 3 static frictional force is acting.
• In situation 2, a sliding frictional force is acting.