Choose the correct answer: A- energy is conserved if. (a) the acting force is a

Question

Choose the correct answer: A- energy is conserved if. (a) the acting force is a conservative force (b) the acting force is a gravitational force (c) the acting force is any type of force B- Mechanical energy cannot be conserved if the acting force is the drag force (True, False) C- Momentum cannot be conserved if the acting force is the drag force (True, False) D. you increase the acting time of a collision the impact force increases (True, False) E- Neglecting air resistance, a projectile will encounter no change of its x-component of its velocity (True, False)

Explanation / Answer

2. A ) Under any force of action mechanical energy is conserved. Hence, the right choice of answer is option "C".

B) Under dragv force mechanical energy is not conserved. Hence it is true.

C) Under drag force some work is done. So momentum is not conserved. Hence, right it v is true.

D) Impact force is given by F = p/t.

so if impact time t is increased, force F decreases. Hence it is False.

E) When air resistance is absent as there is no horizontal force, horizontal component of velocity remains unchanged. Hence the given statement is True.

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