An object with constant mass rests on a horizontal surface whose coefficient of friction is 0.2. If a horizontal force F is applied to the object, what will be the effect(s) on the object? I. It may move with constant speed in the direction of F once it has been set in motion. II. It may remain at rest. III. It may accelerate. IV. It may move with constant speed in an opposite direction
Correct answer: A. I, II and III only
- A. I, II and III only
- B. I and III only
- C. II and IV only
- D. IV only
- E. III only
Explanation
1. It is possible that object starts to accelerate when the frictional force becomes greater enough due to objects motion to equalize the forward force, so the object starts moving at a constant speed. 2. Now, if the force is less than product of coefficients of friction and weight of the object may remain at rest. 3. If the force applied is greater than product of coefficient of friction and weight of the object, the object accelerates on the direction of force.
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