PS - TEST - Chapter 12

Front

What is force?

Back

Force is an interaction that causes an object to change its motion.

Front

Which factor affects the amount of friction between two surfaces?

Back

The roughness of the surfaces.

Front

What is the path that an object follows as it moves?

Back

Trajectory.

Front

What force pulls objects toward the center of the Earth?

Back

Gravitational force.

Front

What is an example of a force?

Back

The push of a hand on a door.

Front

What is friction?

Back

Friction is a force that opposes the motion of an object when it comes into contact with another surface.

Front

What is the unit of force?

Back

The unit of force is the Newton (N).

Front

What is Newton's First Law of Motion?

Back

An object at rest stays at rest, and an object in motion stays in motion unless acted upon by a net external force.

Front

What is acceleration?

Back

Acceleration is the rate of change of velocity of an object.

Front

What is the relationship between mass and weight?

Back

Weight is the force exerted by gravity on an object, calculated as mass times the acceleration due to gravity (W = mg).