WHAT ARE FORCES?

What is a force?

• A force is a type of matter that can expand and compress

• A force is a push or pull that can change the motion or shape of objects

• A force is a type of energy that can create heat

• A force is a type of accelerator that can increase the speed of an object

What is gravity?

• Gravity is a force that repels objects away from each other.

• Gravity is a force that only affects living organisms.

• Gravity is a force that attracts objects towards each other.

• Gravity is a force that is caused by the rotation of the Earth.

Which force opposes motion between two surfaces that are touching one another?

• inertia

• magnetism

• friction

• gravity

What happens when forces on an object are balanced?

• The object comes to a complete stop before bouncing back.

• The object remains at rest or continues to move at a constant velocity.

• The object accelerates in the opposite direction.

• The object changes direction at a slower pace.

What must happen in order for an object to move?

Select TWO.

• Gravity must not act on the object.

• Unbalanced forces must act on the object.

• Balanced forces must act on the object.

• The object's force must overcome the force of friction.

What is the unit of force?

• Degree

• Newton

• Watt

• Volt

A ___________ is a tool that can be used to measure the size of a force.

• pan balance

• thermometer

• spring scale

• measuring cup

If you exert the same gentle force on a bowling ball and a tennis ball, which would be true?

• The bowling ball would accelerate slower but travel farther.

• The tennis ball would accelerate slower but travel farther.

• The bowling ball would accelerate faster and travel farther.

• The tennis ball would accelerate faster and travel farther.

What is friction that exists between air and an object called?

• air pressure

• air resistance

• air friction

• air compression

When a rocket is at rest on Earth's surface, the forces exerted on it are _______.

• balanced

• unbalanced