Revise smart, understand Better

0.000 s

Revise smart, understand Better

5/40 MCQs for:

Dynamics: Newton’s Laws of Motion

Action-reaction forces are:

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.

Unequal in magnitude but point in the same direction.

An object of mass m sits on a flat table. The Earth pulls on this object with force mg, which we will call the action force. What is the reaction force?

The table pushing up on the object with force mg.

The object pulling upward on the Earth with force mg.

The object pushing down on the table with force mg.

The table pushing down on the floor with force mg.

A stone is thrown straight up. At the top of its path, the net force acting on it is:

Instantaneously equal to zero.

Greater than zero, but less than its weight.

Equal to its weight.

Greater than its weight.

Two horizontal forces act on a 5.0 kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

1.2 m/s² due East.

2.0 m/s² at 53° N of E.

2.0 m/s² at 53 m E of N.

1.6 m/s² due North.

Two cars collide head-on. At every moment during the collision, the magnitude of the force the first car exerts on the second is exactly equal to the magnitude of the force the second car exerts on the first. This is an example of:

Newton's third law.

Newton's first law.

Newton's law of gravitation.

Newton's second law.