Laws of Motion Test

Result

Laws of Motion Test - 39

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Question 1
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 13 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 2
4 / -1

To avoid slipping while walking on ice, one should take smaller steps because of the

A
Friction of ice is large

B
Larger normal reaction

C
Friction of ice is small

D
Smaller normal reaction
Question 3
4 / -1

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

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 Newtons 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

Which one of the following is not used to reduce friction?

A
Oil

B
Ball bearings

C
Sand

D
Graphite
Question 6
4 / -1

A body of mass 2 kg is kept by pressing to a vertical wall by a force of 100 N. The coefficient of friction between wall and body is 0.3. Then the frictional force is equal

A
6 N

B
20 N

C
600 N

D
700 N

Solution
Question 7
4 / -1

A boy of mass 40 kg is climbing a vertical pole at a constant speed. If the coefficient of friction between his palms and the pole is 0.8 and g = 10 m/s², the horizontal force that he is applying on the pole is

A
300 N

B
400 N

C
500 N

D
600 N

Solution
Question 8
4 / -1

A
zero

B
15 kJ

C
5 kJ

D
10 kJ

Solution
Question 9
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 10
4 / -1

A car is moving along a straight horizontal road with a speed v_o. lithe coefficient of friction between the tyres and the road is µ, the shortest distance in which the car can be stopped is

A

B

C

D

Solution