Class 8 Friction

Friction always .......….….......

• Helps the motion

• Opposes the motion

• Does not impact motion

• Can not say

Friction is a ...............

• Contact force

• Non contact force

• Magnetic force

• None of these

What kind of substances are known as lubricants?

• Increase friction

• Decrease friction

• Increase or decrease fraction

• None of these

Fluids are ...............

• Gases

• Liquids

• Gases and liquid both

• None of these

Friction is a/an ...............

• Evil

• Foe

• Both (a) & (b)

• None of these

The shape of the airplane is like a

• Bird

• Car

• Dog

• All

Rolling friction is smaller than?

• Sliding friction

• Static Friction

• Fluid friction

• All of these

Lubricants...............

• Increase friction

• Decrease Friction

• Both (a) & (b)

• None of these