Friction

Question 1

Fill in the blanks:
Friction is a force that …… movement because of contact between ….

Answer 1

resists, surfaces

Question 2

Fill in the blanks:
Whenever an object moves against another object, it feels ……. forces. These forces act in the …….. direction to the movement. Friction makes it …….. for things to move.

Answer 2

frictional, opposite, harder

Question 3

Friction is caused by what?

Answer 3

Rough edges locking together when surfaces slide past each other

Question 4

Fill in the blank
……… is used in between surfaces to help reduce friction.

Answer 4

Lubrication

Question 5

How does lubrication help to reduce friction?

Answer 5

It helps parts to slide over each other more easily

Question 6

How can you measure friction?

Answer 6

With a newtonmeter.

Question 7

Fill in the blank:
On a wet road ….. acts as a ……..between the tire and the road and may make the car skid.

Answer 7

Water, Lubricant

Question 8

Give an example of useful friction

Question 9

Give an example of non-useful friction