Laws of Motion (NEET Physics): Questions 104 - 107 of 114

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Question number: 104

» 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: 105

» 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: 106

» 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: 107

» Laws of Motion » Force and Inertia

Assertion-Reason▾

Assertion (Ꭺ)

Block A is moving on horizontal surface towards right under the action of force F. All surfaces are smooth. At the instant shown the force exerted by block A on block B is equal to net force on block B.

Reason (Ꭱ)

From Newton’s third law of motion, the force exerted by block A on B is equal in magnitude to force exerted by block B on A.

Net force acting on each of block A and B

Net Force Acting on Each of Block a and B

Finding force and acceleration on both blocks A and B

Choices

Choice (4) Response
a. Both Ꭺ and Ꭱ are false
b. Ꭺ is true but Ꭱ is false
c. Ꭺ is false but Ꭱ is true
d. Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

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