Page 24 - Primary Seven Notes

Friction

Frictional force refers to the force generated by two surfaces

that contacts and slide against each other.

A friction is a force that tends to oppose motion between ob-
jects. Friction is what happens when any two things rub

against each other. Friction holds back the movement of a slid-

ing object and acts in the opposite direction.

Wheel rolls forward
Push on wheel

Friction resists sliding

Examples of friction

You will find friction everywhere that objects come into con-

tact with each other. Some examples are:

When a car needs to stop, it slows because of the friction be-

tween the brakes and the wheels.

If you run and stop quickly, you can stop because of the fric-

tion between your shoes and the ground.