PHYSICS : REVISION TEST ON TOPICS OF CLASS XI ---VII

A force of 12 N is required to start a uniform plank of wood sliding on a bench for which coefficient of friction is constant. The plank is cut into three equal pieces and these pieces are stacked one above the other. The force now needed to start movement of pile would be
4 N
12 N
24 N
36 N
A block resting on an inclined plane begins to slide down the plane when the angle of inclination is gradually increased to 30 degree. Then the coefficient of friction between the block and plane is
0.50
0.578
0.72
0.866
A body starts rolling down on an inclined plane (angle of plane = 30°) the top half of which is perfectly smooth and the lower half rough. If the body is brought to rest before it reaches the bottom, the ratio of the force of friction and weight of body (F/W) is
0.5
1
2
4
A 44 N block is thrust up a 30 degree inclined plane with an initial speed of 5 m/s. It travels a distance of 1.5 m before it comes to rest. The frictional force acting upon it would be
9.5 N
12.6 N
15.3 N
18.7 N
When a bicycle in motion is being pedaled, the force of friction exerted be the ground on the wheels is such that it acts
in the backward direction on the front wheel and in the forward direction on the rear wheel
in the forward direction on the front wheel and in the backward direction on the rear wheel
in the backward direction on both the front and rear wheels
in the forward direction on both the front and rear wheels.
Which of the following statements about friction is true?
fiction can be reduced to zero
frictional force can accelerate a body
frictional force is proportional to the area of contact between the two surfaces
kinetic friction is always greater than rolling friction
The magnitude of coefficient of static friction between two bodies in contact
always lies between zero and unity
may exceed unity
is less than the coefficient of dynamic friction between the same pair of bodies
depends upon areas of contact
A box is given a push along a surface on which it rests, with a velocity of 6 m/s. If it stops after covering a distance of 5 m, the coefficient of friction between the box and the surface is
0.24
0.36
0.45
0.58
A uniform flexible rope of length 60 m is partly lying on a rough table and is partly just hanging across the edge of the table. If the coefficient of friction between the table and rope is 0.2, the maximum length of rope which can just hang is
10 m
15 m
25 m
40 m
Brakes are applied to a car traveling at 90 km/ hr and it comes to stop 5 seconds there-after. The coefficient of friction between the wheels and road surface is Take g = 10 m/s2
0.18
0.25
0.36
0.5
Description:

TOPIC: FRICTION

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Kajal Sengupta
Physics 9th to 12 th grade,CIE, Edexcel, AP, IB , CBSE, ICSE
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