Chapter 18 Study Guide: Forces

A _______________ is a push or pull that causes change in motion.

• friction

• lever

• force
• gravity

_______________ is a force that opposes motion.

• Friction
• Balance

• Fulcrum

• Simple machine

_______________ is the force of attraction that Earth exerts on an object.

• Gravity
• Force

• Friction

• Lever

A _______________ is a device made of only a few parts that makes work easier.

• force

• simple machine
• friction

• balance

An _______________ is a ramp or other sloping surface.

• inclined plane
• pulley

• fulcrum

• lever

A _______________ is a wheel with a rope that lets you change the direction in which you move an object.

• fulcrum

• force

• pulley
• lever

A _______________ is a bar that makes it easier to move things.

• lever
• fulcrum
• gravity
• pulley

A _______________ is the balance point on a lever.

• lever

• pulley

• fulcrum
• friction

In which of the following situations is work occurring?

• You are brainstorming an essay topic

• You are pushing a brick wall

• You are throwing a football

• You are holding a book in your hands

If two arm wrestlers exert a force on each other's hands and their hands do not move, which type of force is occurring?

• Balanced Force

• Unbalanced Force

• Strong Force

• Weak Force