MEDIUM
8th CBSE
IMPORTANT
Earn 100

Why is rolling friction less than sliding friction? (Hint Draw an illustration of the surfaces in contact in both cases. In which case is the area of the contact surface greater?)

Important Questions on Friction

MEDIUM
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 12 - Friction>Higher-order Thinking Skills>Q 2
Can you think of a situation where it is necessary to increase air resistance on a falling object? How is it done?
MEDIUM
8th CBSE
IMPORTANT
New Science Ahead 8>Chapter 12 - Friction>Higher-order Thinking Skills>Q 3
Water on a smooth floor can make you slip. This means water is also a lubricant. Can you think of reasons why oil and grease, and not water, are used in machines as lubricants? (Hint: Think of evaporation and corrosion.)