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5/40 MCQs for:

Dynamics: Newton’s Laws of Motion

An object of mass 6000 kg rests on the flatbed of a truck. It is held in place by metal brackets that can exert a maximum horizontal force of 9000 N. When the truck is traveling 15 m/s, what is the minimum stopping time if the load is not to slide forward into the cab?

5.0 s.

13 s.

23 s

10 s.

A constant net force acts on an object. Describe the motion of the object.

Constant acceleration.

Constant velocity.

Constant speed.

increasing acceleration.

A person of weight 480 N stands on a scale in an elevator. What will the scale be reading when the elevator is accelerating downward at 4.00 m/s²?

284 N.

196 N.

676 N.

480 N.

In the absence of an external force, a moving object will:

Slow down and eventually come to a stop.

Move with constant velocity.

Go faster and faster.

Stop immediately.

Which of Newton's laws best explains why motorists should buckle-up?

the second law.

The third law.

The first law.

The law of gravitation.