Write in brief, how does a bicycle stop when its brakes are applied. 

Explain why car wheels often spin on icy road.

Some machines use streamlined shape to reduce friction. Name them.

Explain the types of friction with examples.

Write a short note on term ‘drag’. Explain why objects moving in fluids should have streamlined shape.

In which ways friction between the two surfaces can be minimized?

Explain with four examples that sometimes, force of friction is desirable.

Write some disadvantages of force of friction.