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5/40 MCQs for:

Dynamics: Newton’s Laws of Motion

An antitank weapon fires a 3.00-kg rocket which acquires a speed of 50.0 m/s after traveling 90.0 cm down a launching tube. Assuming the rocket was accelerated uniformly, what is the average force acted on it?

2.82 x 103 N.

2.00 x 103 N

4.17 x103 N.

3.62 x 103 N.

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?

196 N.

284 N.

676 N.

480 N.

A golf club hits a golf ball with a force of 2400 N. The golf ball hits the club with a force:

Slightly more than 2400 N.

Slightly less than 2400 N.

Close to 0 N.

Exactly 2400 N.

Action-reaction forces are:

Unequal in magnitude but point in the same direction.

Unequal in magnitude and point in opposite directions.

Equal in magnitude and point in opposite directions.

Equal in magnitude but point in the same direction.

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?

75 m.

150 m.

30 m.

15 m.