Active Review Unit D

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 with the same speed and in the same direction unless acted upon by an unbalanced force.

Front

What is friction?

Back

Friction is the force that opposes the relative motion of two surfaces in contact.

Front

What happens to an object's motion when an unbalanced force acts upon it?

Back

The object's motion changes; it may start moving, stop, or change direction.

Front

How do you calculate net force when two forces are acting in the same direction?

Back

You add the magnitudes of the two forces together.

Front

What does Newton's Third Law of Motion state?

Back

For every action, there is an equal and opposite reaction.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object, while weight is the force exerted by gravity on that mass.

Front

What is an unbalanced force?

Back

An unbalanced force is a force that causes an object to accelerate, change direction, or change its state of motion.

Front

What is the role of gravity in motion?

Back

Gravity is a force that attracts two bodies towards each other, affecting their motion.

Front

What is acceleration?

Back

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

Front

What is the formula for calculating force?

Back

Force (F) = mass (m) × acceleration (a).