Factors Affecting Friction

Q.

Why is rolling friction less than sliding friction?

Q.

Give any two uses of isotopes.

Q.

What is the coefficient of friction?

Q.

What is limiting friction?

Q.

Which of the following statements is not true about hydrogen?

1. Dihydrogen is a good reducing agent.

2. Dihydrogen does not act as a reducing agent.

3. Hydrogen has three isotopes out of which tritium is the most common.

4. Both [A] and [C].

Q.

Explain why do sportsmen use shoes with spikes? - GK Q&A

Q. What is the difference between static friction and limiting friction?

Q.

What are the factors that affect friction? Explain in detail.

Q. What are the ways to increase friction

Q. Frictional force depends on:

1. roughness of the surfaces
2. shape of the surfaces
3. colour of the surfaces
4. area of the surfaces

Q.

The frictional force exerted by fluids is also called ___.

Q.

Everyone knows that heavier objects require more force to move the same distance than lighter objects. Which law can explain this scenario?

1. Third law of motion

2. Second law of motion

3. First law of motion

4. None of the above

Q. What are the factors affecting fluid friction?

Q.

Iqbal has to push a lighter box and Seema has to push same heavier box. Who will have to apply larger force and why?

Q.

State whether the following statement is true or false:

The force of friction is always equal and opposite to the applied force.

1. True
2. False

Q.

What is done to increase friction between the tyres and road?

Q. causes of friction

Q.

Friction can be reduced by

1. the use of lubricants.

2. polishing surfaces.

3. by increasing the height.

4. Both (A) and (B).

Q. Fluid friction depends on which of the following properties of fluid?

1. Shape
2. Nature
3. Colour
4. Speed

Q. A child sliding down the slide is an example of what type of friction?

1. Static friction
2. Sliding friction
3. Rolling friction
4. Fluid friction

Q.

Which is the most important property of Nano-materials?

Q.

Explain why, it is easier to drag a mat on floor when nobody is sitting on it but much more difficult to drag the same mat when a person is sitting on it.

Q.

Can a solid act as a lubricant? If yes give examples?

Q.

Why do we slip when we step on a banana peel? Explain.

Q.

Which type of surfaces produce (a) least friction, and (b) too much friction ?

Q. The maximum value of friction is known as the ___.

1. static friction
2. sliding friction
3. limiting friction
4. rolling friction

Q. We use fine powder while playing carrom board because ___.

1. it increases friction
2. it decreases friction
3. it does not change anything
4. it minimizes air drag

Q. The friction between two surfaces does not depend on one of the following. This one is:
(a) amount of surface area of the two objects which is in contact with each other
(b) weight of the object which tends to move on the surface of other object
(c) degree of smoothness of surfaces of two objects in contact with each other
(d) degree of roughness of surfaces of two objects in contact with each other

Q.

(a) Given examples to show that firction depends on the nature of two surfaces in contact.
(b) Give an example to show that friction depends on the force with which the two surfaces are pressed together.

Q. Frictional force acts in the :

1. Direction of motion.
2. Opposite direction of relative motion
3. Perpendicular direction of relative motion.
4. Vertical direction to the surface.