WorksheetsForces & Laws of Motion
Total questions: 15
Worksheet time: 45mins
Which of the following statement is not correct for an object moving along a straight path in an accelerated motion?
Its speed keeps changing
Its velocity always changes
It always goes away from the earth
A force is always acting on it
A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goal keeper to
exert larger force on the ball
reduce the force exerted by the ball on hands
increase the rate of change of momentum
decrease the rate of change of momentum
A passenger in a moving train tosses a coin which falls behind him. It means that motion of the train is
accelerated
uniform
retarded
along circular tracks
An object of mass 2 kg is sliding with a constant velocity of 4 m s–1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is
32 N
0 N
10 N
2 N
A water tanker filled up to 2 / 3 of its height is moving with a uniform speed. On sudden application of the brake, the water in the tank would
move backward
move forward
be unaffected
rise upwards
How much net force is required to accelerate a 1000 kg car at 4 m/s2?
250 N
4000 N
0.004 N
400 N
If a net force of 5 N was constantly applied on 200 g object at rest, how long will it take to raise its velocity to 150 m/s?
2 sec
6 sec
4 sec
8 sec
A sedan car of mass 200kg is moving with a certain velocity. It is brought to rest by the application of brakes, within a distance of 20m when the average resistance being offered to it is 500N.What was the velocity of the motor car?
10 m/s
20 m/s
30 m/s
0 m/s
A driver accelerates his car first at the rate of 4 m/s2 and then at the rate of 8 m/s2 . Calculate the ration of the forces exerted by the engines?
4:1
1:2
2:1
1:4
Two objects of masses of 100 gm and 200 gm are moving in along the same line and direction with velocities of 2 ms-1 and1 ms-1 respectively. They collide and after collision, the first object moves at a velocity of 4 ms-1. Determine the velocity of the second object?
0 m/s
0.5 m/s
1 m/s
2 m/s
A bullet of mass 10 gm is fired with an initial velocity of 20 m/s from a rifle of mass 4 kg. Calculate the initial recoil velocity of the rifle?
v = + 0.05 m/s
v = - 0.05 m/s
v = - 0.5 m/s
v = + 0.5 m/s
Velocity versus time graph of a ball of mass 100 g rolling on a concrete floor is shown below. Calculate the acceleration and the frictional force of the floor on the ball?
a = - 10 m/s2
F = - 1 N
a = - 1 m/s2
F = - 10 N
a = + 10 m/s2
F = + 1 N
a = + 10 m/s2
F = + 10 N
A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 s. Find its acceleration. Find the force acting on it if its mass is 6 metric tonnes (Hint: 1 metric tonne = 1000 kg).
a = 1 m/s2
F = 12000 N
a = 4 m/s2
F = 12000 N
a = 1 m/s2
F = 10000 N
a = 2 m/s2
F = 12000 N
Two objects, each of mass 1.5 kg are moving in the same straight line but in opposite directions. The velocity of each object is 2.5 m s−1 before the collision during which they stick together. What will be the velocity of the combined object after collision?
10 m/s
20 m/s
0 m/s
40 m/s
An object of mass 1 kg travelling in a straight line with a velocity of 10 m s−1 collides with, and sticks to, a stationary wooden block of mass 5 kg. Then they both move off together in the same straight line. Calculate the total momentum just before the impact and just after the impact. Also, calculate the velocity of the combined object.
Total momentum = 10 kg.m/s
Velocity of the combined object after collision = 5/3 m/s
Total momentum = 20 kg.m/s
Velocity of the combined object after collision = 5/3 m/s
Total momentum = 20 kg.m/s
Velocity of the combined object after collision = 3/5 m/s
Total momentum = 10 kg.m/s
Velocity of the combined object after collision = 3/5 m/s
