Choose the correct answer: A. Mechanical energy is conserved if, (a) the acting

Question

Choose the correct answer: A. Mechanical 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. If 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) answer) option a) the acting force is a conservative force

Reason : total mechanical energy of a system remains constant when the forces acting are conservative forces

B) false

Reason : drag is non conservative force , so mechanical energy is not conserved

C) false

Reason : since external force is acting, momentum is not conserved

D) true

Reason : impulse = force*time = F*(t)

If time increases, then impulse increases

E) true

Reason : x component of velocity is given by

Vx = Vcos, here is angle at which projectile is projected

So it doesn't change

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