Balance and Unbalance Forces 7

What happens when balanced forces act on an object?

• The object speeds up

• The object remains at rest or moves at a constant speed

• The object changes direction

• The object accelerates

What is Newton's First Law also called?

• Law of Acceleration

• Law of Universal Gravitation

• Law of Inertia

• Law of Action and Reaction

Newton's First Law states that an object in motion will stay in motion unless acted upon by an __________ force.

The acceleration of an object is directly proportional to the applied force and inversely proportional to its ____.

When a car suddenly stops, passengers move forward because of _______.

The image shows a person pushing a box. If the force applied is greater than the friction, what will happen?

• The box will remain still

• The box will move in the direction of the push

• The box will rise into the air

• The box will disappear

The force keeping the roller coaster moving in a circular path is called:

• Gravitational force

• Friction

• Centripetal force

• Unbalanced force

What force is opposing the motion of the box in the image?

According to Newton's Second Law, force is calculated using the formula F = ____ x ____.

• velocity x time
• energy x mass
• mass x acceleration
• force x distance

Which of the following is an example of unbalanced forces?

• A car traveling at a constant speed on a straight road

• A person sitting on a chair

• A soccer ball being kicked

• A book resting on a table