Force and Motion

Front

What happens when two equal forces act in opposite directions on an object?

Back

The object remains in the same place.

Front

What force keeps satellites in orbit around Earth?

Back

Gravity.

Front

What is the term for the force that opposes the motion of an object when it moves across a surface?

Back

Friction.

Front

What is acceleration?

Back

Any change in the speed or direction of an object.

Front

If a man and a ball travel 90 m in 9 seconds, what is their average speed?

Back

10 m/s.

Front

What is the definition of force?

Back

A push or pull on an object.

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 the formula for calculating speed?

Back

Speed = Distance / Time.

Front

What is inertia?

Back

The tendency of an object to resist changes in its state of motion.

Front

What is the relationship between mass and weight?

Back

Weight is the force of gravity acting on an object's mass.