Rolling and Using Treads to Change Friction

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

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

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

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. 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. Statement 1: Wrestlers apply oil on their bodies to increase friction.
Statement 2: Grooving provides a better grip.
Choose the correct option.

1. Only statement 2 is correct.
2. Both statements are incorrect.
3. Both statements are correct.
4. Only statement 1 is correct.

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

1. False
2. True

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

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

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

Q. Why is it advantageous to use ball bearings between machine surfaces?

1. Sliding friction is less than rolling friction.
2. Rolling friction is less than sliding friction.
3. Sliding friction is equal to rolling friction.
4. Static friction is more than sliding friction.