Laws of Motion-Laws of Friction (NEET Physics): Questions 28 - 31 of 33

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Question number: 28

» Laws of Motion » Laws of Friction

MCQ▾

Question

Block A weighs 6 N and block B weighs 4 N. The coefficient of kinetic friction is 0.25 for all surfaces. find the force F to slide B at a constant speed when A is held at rest.

Choices

Choice (4) Response
a.

4N

b.

1N

c.

2N

d.

3.5N

Question number: 29

» Laws of Motion » Laws of Friction

MCQ▾

Question

A body of mass m is released from the top of a rough inclined plane as shown in figure. If the frictional force be F, then body will reach the bottom with a velocity

Inclined plane with body of mass m

Inclined Plane With Body of Mass M

A body of Mass on inclined plane – velocity to reach the bottom is calculated

Choices

Choice (4) Response
a.

2m(mghFL)

b.

2m(mgh+FL)

c.

1m(mghFL)

d. None of the above

Question number: 30

» Laws of Motion » Laws of Friction

MCQ▾

Question

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

Finding the friction on B due to A

Finding the Friction on B Due to A

The wall is smooth but the surfaces of A and B in contact are rough in equilibrium

Choices

Choice (4) Response
a.

The system cannot remain in equilibrium

b.

is downward

c.

is upward

d.

Is zero

Question number: 31

» Laws of Motion » Laws of Friction

MCQ▾

Question

Choose the correct statements -

(1) Force of friction is partially independent of microscopic area of surface in contact and relative velocity between them, (if it is not high)

(2) Normally with increase in smoothness friction decreases. But if the surface area are made too smooth by polishing and cleaning the bonding force of adhesion will increase and so the friction will increase resulting in ‘Cold welding’

(3) Friction is a non-conservative force, i. e. work done against friction is path dpendent.

(4) Force of friction depends on area

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response
a.

2 and 4 are correct

b.

1, 2 and 3 are correct

c.

1 and 2 are correct

d.

1 and 3 are correct

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