Chapter 3 Unit 3

Question 1

What is friction?

Answer 1

Force created when two surfaces run against each other

Question 2

What is a wheel?

Answer 2

Round disc object that turns around an axle

Question 3

How does wheels reduce friction?

Answer 3

Only small part of wheel makes contact on the surface it moves

Question 4

For wheel to work properly they must…(4)

Answer 4

• kept upright position
• kept from falling off
• kept from rubbing against body of vehicle while it moves
• turn smoothly around a fixed axle

Question 5

What are the two different types of wheels

Answer 5

• filled with air

* solid