Laws of Motion Test

Result

Laws of Motion Test - 38

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Question 1
4 / -1

Maximum value of static friction is called

A
Limiting friction

B
Rolling friction

C
Normal reaction

D
Coefficient of friction
Question 2
4 / -1

Pulling force making an angle θ to the horizontal is applied on a block of weight W placed on a horizontal table. If the angle of friction is α, then the magnitude of force required to move the body is equal to

A

B

C

D
Question 3
4 / -1

In the figure shown, a block of weight 10 N is resting on a horizontal surface. The coefficient of static friction between the block and the surface µ_s = 0.4. A force of 3.5 N will keep the block in uniform motion, once it has been set in motion. A horizontal force of 3 N is applied to the block, then the block will

A
Move over the surface with constant velocity

B
Move having accelerated motion over the surface

C
Not move

D
First it will move with a constant velocity for some time and then will have accelerated motion

Solution
Question 4
4 / -1

Two masses A and B of 10 kg and 5 kg respectively are connected with a string passing over a frictionless pulley fixed at the corner of a table as shown. The coefficient of static friction of A with table is 0.2. The minimum mass of C that may be placed on A to prevent it from moving i

A
15 kg

B
10 kg

C
5 kg

D
12 kg

Solution
Question 5
4 / -1

A uniform metal chain is placed on a rough table such that one end of chain hangs down over the edge of the table. When one-third of its length hangs over the edge, the chain starts sliding. Then, the coefficient of static friction is

A

B

C

D

Solution
Question 6
4 / -1

Which of the following statements is not true?

A
The coefficient of friction between two surfaces increases as the surface in contact are made rough

B
The force of friction acts in a direction opposite to the applied force

C
Rolling friction is greater than sliding friction

D
The coefficient of friction between wood and wood is less than 1.
Question 7
4 / -1

A heavy uniform chain lies on a horizontal table-top. If the coefficient of friction between the chain and table surface is 0.25, then the maximum fraction of length of the chain, that can hang over one edge of the table is

A
20%

B
25%

C
35%

D
15%

Solution
Question 8
4 / -1

Work done by a frictional force is

A
Negative

B
Positive

C
Zero

D
All of these
Question 9
4 / -1

A horizontal force of 10 N is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is 0.2. The weight of the block is

A
2 N

B
20 N

C
50 N

D
100 N

Solution
Question 10
4 / -1

A 20 kg block is initially at rest on a rough horizontal surface. A horizontal force of 75 N is required to set the block in motion. After it is in motion, a horizontal force of 60 N is required to keep the block moving with constant speed. The coefficient of static friction is

A
0.38

B
0.44

C
0.52

D
0.60

Solution