Question

Match the friction managing agents given in list
A
1. spikes
2. treads and groves
3. talcum powder
4. grease
5. stream-lining

B
a) air crafts
b) rollers
c) ball bearings
d) carrom board
e) tyres
f) shoes

Answer 1

1. e
2. F
3. d
4. c
5. a

Answer 2

Answer:

1. Spikes - (f) shoes

Spikes are added to the shoes to increase friction between the ground and the shoes which provides a better grip on the ground which helps in running.

2. Treads and groves - (e) tyres

The treads and groves on the tyres increase the friction between the road and the tyres which provides a better grip on the roads.

3. Talcum powder - (d) carrom board

Talcum powder is applied on the carrom board to reduce the friction between the board and pieces which makes the pieces slide more easily with less effort.

4. Grease - (c) ball bearings

Grease is applied on the ball bearings to reduce the friction between the balls and the sliding surface which increases the efficiency of the ball bearings.

5. Stream-lining - (a) air crafts

Aircrafts are made in stream-lined shapes to cut through the air and to reduce the friction between the air and the aircraft.