Effect of Area of Contact on Friction

Q. Statement 1: Sliding friction is greater than rolling friction.

Statement 2: Sliding friction is greater than static friction.

Which of the following statement(s) is/are correct?

1. Statement 2 only
2. Both the statements are correct
3. Statement 1 only
4. Both the statements are incorrect

Q. Frictional force in a ceiling fan is reduced by using______.

Q. Which one need lesser friction?
(i)A boy is pushing two identical boxes keeping one onto another on the road.
(ii)Another boy is pushing the same two identical boxes keeping them seperately on the same road.

1. Case (i)
2. Case (ii)
3. Both the case (i) and case (ii)
4. Cannot be predicted

Q.

Assuming all surfaces to be equally smooth, friction will change if the object is flipped and then dragged, as shown in the figure.

1. True

2. False

Q. Friction is dependent on the orientation of the object.

1. True
2. False

Q. Choose the factor which does not affect the frictional force on an object.

1. Contact area
2. Weight
3. Roughness
4. Material

Q. Three blocks of same material are kept on a table where the frictions are related as $f_1<f_2<f_3.$

1. $f_1$
2. $f_3$
3. $f_2$

Q. Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement. [1 mark]

(a) rolling, static, sliding
(b) rolling, static, sliding
(c) static, sliding, rolling
(d) sliding, static, rolling

Q. For electroplating, the particle to be plated is made the ___________ . (anode/cathode)

Q. You release two objects A and B from the same height (H) of an inclined plane. You see that object A goes larger distance than the object B before coming to rest. The objects have equal weights and their outer surfaces are equally polished. Which of the following options can be a possible case?

1. The size of the object A is larger than the size of the object B
2. The size of the object B is larger than the size of the object A
3. Object A is of spherical shape and object B is of rectangular box shape
4. Object B is of spherical shape and object A is of rectangular box shape

Q. Which one need lesser friction?
(i)A boy is pushing two identical boxes keeping one onto another on the road.
(ii)Another boy is pushing the same two identical boxes keeping them seperately on the same road.

1. Case (i)
2. Cannot be predicted
3. Both the case (i) and case (ii)
4. Case (ii)

Q.

For the same pair of bodies, the correct relation between different types of friction is:

1. Static friction > sliding friction > rolling friction.

2. Sliding friction > rolling friction > static friction.

3. Static friction > rolling friction > sliding friction.
4. Sliding friction > static friction > rolling friction.

Q.

Consider the following statements:

Statement 1: Friction is caused due to interlocking of irregularities present on the surfaces in contact.
Statement 2: Frictional force increases if the two surfaces are pressed harder.

Which of these statements is/are correct?

1. Only statement 1 is correct.

2. Both the statements are correct.

3. Neither of the statements is correct.

4. Only statement 2 is correct.