Forces & friction

Question 1

What do different types of forces include?

Answer 1

Gravitational, electrical, magnetic, elastic and friction

Question 2

How is drag caused?

Answer 2

It is caused by the liquid of an object moving through a fluid

Question 3

How is friction caused?

Answer 3

Tiny bumps on the surface which catch together

Question 4

Name 3 uses for friction

Answer 4

Grip for shoes and tyres, bike brakes use friction to slow down wheels, air resistance slows down parachutes

Question 5

Name 3 disadvantages of friction

Answer 5

Slows down moving machinery, causes overheating, air resistance slows down vehicles

Question 6

How is overheating and air resistance combated?

Answer 6

Grease or oil is applied and designed with the purpose that air slips smoothly over the bonnet

Question 7

How can we slow down a bike wheel?

Answer 7

Rubber brakes blocks grip against the rim

Question 8

How does contact friction occur?

Answer 8

All surfaces are rough on a small scale