Ways of Increasing Friction

Q.

What are the methods of reducing friction?

Q.

Why are vehicle tyres treaded?

1. To increase friction

2. To reduce the overall weight of the tyre

3. To decrease friction

4. To decrease grip

Q.

Which of the following surfaces will offer the least amount of friction?

1. Sandpaper

2. Marble floor

3. Ply board

4. Tree bark

Q.

Force of friction decreases with the increase in weight of body

1. True
2. False

Q.

__________ is an example of wedge. (Knife/ Tong)

Q. Why are maglev trains faster than high speed trains?

Q.

Which of the Following Is Not a Smooth Surface?

1. The surface of wet soap

2. Surface of tyres

3. Glazed tiles

4. Surface of mirror

Q.

The force of friction does not increase with the increase in the weight of the body.

1. True
2. False

Q.

Which of the following is a way to increase friction?

1. Sand

2. Road

3. Ice

4. Same on all cases

Q. In order to increase his grip, a kabaddi player rubs his hands with .

1. sand
2. water
3. grease
4. oil

Q.

Kabaddi players usually rub their hands with soil before the match. Why?

1. To decrease the friction between the hands
2. To increase the friction between the hands

3. To decrease the pressure between the hands

4. To increase the pressure between the hands

Q. When the brake of a train is applied, it slows down, is responsible for it.

1. light
2. friction
3. gravity

Q.

Choose the correct option(s) regarding treading on tyres.

1. Having treads ensure tyres do not skid or slip on a rainy day

2. Having treads differentiates one brand of tyre from the other

3. Having treads in racing cars reduce friction and hence is undesirable

4. Having treads is advantageous as it increases the thickness of the tyres

Q. Having treads is advantageous as it increases the thickness of the tyres

1. True
2. False

Q.

Why is having treads on tyres undesirable for racing cars (like the Formula1 cars)?

1. Treads increase friction and hence tyres start skidding

2. Tyres cannot take advantage of the plowing effect on hard roads if they have treads and hence friction will reduce

3. None of the above

4. Friction would reduce because treads would make F1 tyres smaller

Q. Having treads ensure tyres do not skid or slip on a rainy day.

1. False
2. True

Q.

Which of the following methods can decrease the friction?

1. Applying lubricants to machinery

2. Applying powder on carrom board

3. Making shoes with spikes

4. Adding wheels in a car