Laws of Motion Test

Result

Laws of Motion Test - 85

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Question 1
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
Question 2
4 / -1

A block A with mass 100 kg is resting on another block B of mass 200 kg. As shown in figure a horizontal rope tied to a wall holds it. The coefficient of friction between A and B is 0.2, while coefficient of friction between B and the ground is 0.3. The minimum required force F to start moving B will be

A
900 N

B
100 N

C
1100 N

D
1200 N

Solution
Question 3
4 / -1

A box is lying on a inclined plane what is the coefficient of static friction, if the box starts sliding when an angle of inclination is 60°

A
1.173

B
1.732

C
2.732

D
1.677

Solution
Question 4
4 / -1

A block of mass 2 kg is kept on the floor. The coefficient of static friction is 0.4. If a force F of 2.5 Newton\'s is applied on the block as shown in the figure, the frictional force between the block and the floor will be

A
2.5 N

B
5 N

C
7.84 N

D
10 N

Solution
Question 5
4 / -1

If a ladder weighing 250 N is placed against a smooth vertical wall having coefficient of friction between it and floor is 0.3, then what is the maximum force of friction available at the point of contact between the ladder and the

A
75 N

B
50 N

C
35 N

D
25 N

Solution
Question 6
4 / -1

Which activity is not based upon friction

A
Writing

B
Speaking

C
Hearing

D
Walking
Question 7
4 / -1

The maximum speed that can be achieved without skidding by a car on a circular unbanked road of radius R and coefficient of static friction µ, is

A

B

C

D

Solution
Question 8
4 / -1

A body of mass 2 kg is being dragged with uniform velocity of 2 m/s on a rough horizontal plane. The coefficient of friction between the body and the surface is 0.20. The amount of heat generated in 5 sec is= 4.2 j/cal and g = 9.8 m/s²)

A
9.33 cal

B
10.21 cal

C
12.67 cal

D
13.34 cal

Solution
Question 9
4 / -1

Two carts of masses 200 kg and 300 kg on horizontal rails are pushed apart. Suppose the coefficient of friction between the carts and the rails are same. If the 200 kg cart travels a distance of 36 m and stops, then the distance travelled by the cart weighing 300 kg is

A
32 m

B
24 m

C
16 m

D
12 m

Solution
Question 10
4 / -1

A body B lies on a smooth horizontal table and another body A is placed on B. The coefficient of friction between A and B is g. What acceleration give to B will cause slipping to occur between A and B

A
µg

B
g/µ

C
µ/g

D

Solution