AP (Advanced Placement) Physics(B-C): Questions 1 of 921

Question

MCQ▾

In which of the following situations the net force on the object must be zero?

Choices

Choice (5) Response

a.

A box is sliding down a frictionless ramp after being released at the top of the ramp.

b.

A satellite is moving at constant speed in a circular orbit.

c.

A box is sliding at constant speed across a level surface.

d.

All of the above

e.

None of the above

Answer

c.

Explanation

  • From Newton՚s second law of motion, the force is given as,

  • The net force on an object is zero if object does not experience any acceleration in any direction.
  • To sliding box down a frictionless ramp after being released at the top of the ramp, the box must experience acceleration due to gravity; therefore, some force is exerted on the box.
  • To move the satellite at constant speed in circular orbit, there must be an unbalanced centripetal force to keep the satellite in circular path.
  • To slide a box with constant speed across a level surface, no acceleration experience by box, so in this case the net force on the box be zero.

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