In a situation the contact force by a rough horizontal surface on a body placed on it has constant magnitude. If the angle between this force and the vertical is decreased, the frictional force between the surface and the body will

1. increase

2. decrease

3. remain the same

4. may increase or decrease

Subtopic:  Friction |
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While walking on ice, one should take small steps to avoid slipping. This is because smaller steps ensure

1. larger friction

2. smaller friction

3. larger normal force

4. smaller normal force

Subtopic:  Friction |
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A body of mass M is kept on a rough horizontal surface (friction coefficient = µ). A person is trying to pull the body by applying a horizontal force but the body is not moving. The force by the surface on A is F where

1. F = Mg

2. F = µ Mg

3. Mg  ≤ F ≤  Mg $$\sqrt{1+\mu^2}$$

4. Mg  ≥ F ≥ Mg $$\sqrt{1-\mu^2}$$

Subtopic:  Friction |
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A scooter starting from rest moves with constant acceleration for a time Δt1 then with a constant velocity for the next Δt2 and finally with a constant deceleration for the next Δt3 to come to rest. A 500 N man sitting on the scooter behind the driver manages to stay at rest with respect to the scooter without touching any other part. The force exerted by the seat on the man is

1. 500 N throughout the journey

2. less than 500 N throughout the journey

3. more than 500 N throughout the journey

4. > 500 N for time Δt1 and Δt3 and 500 N for Δt2

Subtopic:  Friction |
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Consider the situation shown in the figure. The wall is smooth but the surfaces of $$A$$ and $$B$$ in contact are rough. The friction on $$B$$ due to $$A$$ in equilibrium:

 1 is upward 2 is downward 3 is zero 4 the system cannot remain in equilibrium

Subtopic:  Friction |
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Suppose all the surfaces in the previous problem are rough. The direction of friction on B due to A

1. is upward

2. is downward

3. is zero

4. depends on the masses of A and B

Previous problem: Consider the situation shown in the figure. The wall is smooth but the surfaces of A and B in contact are rough.

Subtopic:  Friction |
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Two cars of unequal masses use similar tyres. If they are moving at the same initial speed, the minimum stopping distance

1. is smaller for the heavier car

2. is smaller for the lighter car

3. is the same for both cars

4. depends on the volume of the car

Subtopic:  Friction |
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In order to stop a car in shortest distance on a horizontal road, one should:

 1 apply the brakes very hard so that the wheels stop rotating. 2 apply the brakes hard enough to just prevent slipping. 3 pump the brakes (press and release). 4 shut the engine off and not apply brakes.
Subtopic:  Friction |
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A block A kept on an inclined surface just begins to slide if the inclination is 30°. The block is replaced by another block B and it is found that it just begins to slide if the inclination is 40°.

1. mass of A > mass of B

2. mass of A < mass of B

3. mass of A = mass of B

4. All the three are possible

Subtopic:  Friction |
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A boy of mass M is applying a horizontal force to slide a box of mass M' on a rough horizontal surface. The coefficient of friction between the shoes of the boy and the floor is µ and that between the box and the floor is µ'. In which of the following cases it is certainly not possible to slide the box?

1. µ < µ’, M < M’

2. µ > µ’, M < M’

3. µ < µ', M'> M’

4. µ > µ', M > M’

Subtopic:  Friction |
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