Rolling and Using Treads to Change Friction

Q. What is gear. Explain in simple terms.

Q. During a Formula 1 match, it begins to rain. The driver suggests a change of tyres to ones having more grooves. What could be the reason behind this?

1. to increase speed
2. to increase handling due to better traction
3. to reduce the weight of the car
4. because of better design and aesthetics

Q. Why do tyres have treads?

1. To reduce the overall weight of the tyre
2. To make tyres last longer
3. To increase friction on wet roads
4. To decrease friction on rough roads

Q. Why don't we use elastic measuring tape to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with an elastic tape?

Q. If we apply a force towards right on a block kept at rest on the ground, the friction will act:

1. Upward
2. Downward
3. Rightward
4. Leftward

Q. Why don't we use elastic measuring tape to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with an elastic tape?

Q. A wooden block is lying on a horizontal table. A 2 N force is applied to the block in horizontal direction, and still the block remains at rest. What is the force of friction offered by the table?

1. To increase friction
2. To decrease friction
3. To decrease grip
4. To reduce the overall weight of the tyre

Q. Which of the following devices is used to measure weight?

1. Ball bearing
2. Spike
3. Sole
4. Hook

Q. Why don't we use elastic measuring tape to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with an elastic tape?

Q. Why don't we use elastic measuring tape to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with an elastic tape?

Q. Slick tyres offer far more grip as compared to treaded tyres on dry surfaces.

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. Friction would reduce because treads would make F1 tyres smaller
4. None of the above