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5/40 MCQs for:

Dynamics: Newton’s Laws of Motion

A sports car of mass 1000 kg can accelerate from rest to 27 m/s in 7.0 s. What is the average forward force on the car?

2.6 X 102 N.

1.9 X 105 N.

3.9 X 103 N.

2.7 X 104 N.

A 10-kg box sitting on a horizontal surface is pulled by a 5.0-N force. A 3.0-N friction force retards the motion. What is the acceleration of the object?

0.30 m/s².

0.50 m/s².

5.0 m/s².

0.20 m/s².

Action-reaction forces are:

Equal in magnitude and point in opposite directions.

Unequal in magnitude but point in the same direction.

Equal in magnitude but point in the same direction.

Unequal in magnitude and point in opposite directions.

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 distance if the load is not to slide forward into the cab?

150 m.

30 m.

75 m.

15 m.

A block of mass m slides down a frictionless plane inclined at an angle θ with the horizontal. The normal reaction force exerted by the plane on the block is:

mgsinθ.

mg.

Zero, since the plane is frictionless.

mgcosθ.