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WorksheetsONLINE CLASS TEST
Total questions: 10
Worksheet time: 6mins
A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to:
Exert large force on the ball
Increases the force exerted by the ball on hands
Increase the rate of change of momentum
Decrease the rate of change of momentum
An object of mass 2 kg is sliding with a constant velocity of 4 m/s on a friction less horizontal table. The force required to keep the object moving with the same velocity is:
32 N
0 N
2 N
8 N
Newton’s third law of motion explains the two forces namely ‘action’ and ‘reaction’ coming into action when the two bodies are in contact with each other. These two forces:
Always act on the same body
Always act on the different bodies in opposite directions
Have same magnitude and direction
Acts on either body at normal to each other
In a rocket, a large volume of gases produced by the combustion of fuel is allowed to escape through its tail nozzle in the downward direction with the tremendous speed and makes the rocket to move upward.Which principle is followed in this take off of the rocket?
Moment of inertia
Conservation of momentum
Newton’s third law of motion
Newton’s law of gravitation
A water tank filled upto 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
Come to the rest
Be unaffected
The seat belts are provided in the cars so that if the car stops suddenly due to an emergency braking, the persons sitting on the front seats are not thrown forward violently and saved from getting injured. Can you guess the law due to which a person falls in forward direction on the sudden stopping of the car?
Newton’s first law of motion
Newton’s second law of motion
Newton’s third law of motion
Newton’s law of gravitation
When a balloon held between the hands is pressed, its shape changes. This happens because:
Balanced forces act on the balloon
Unbalanced forces act on the balloon
Frictional forces act on the balloon
Gravitational force acts on the balloon
The speed of a car weighing 1500 kg increases from 36 km/h to 72 km/h uniformly. What will be the change in momentum of the car?
15000 kg km/h
15000 kg m/s
54000 kg m/s
54000 g m/s
A passenger in a moving train tosses a coin which falls behind him. Observing this statement what can you say about the motion of the train?
Accelerated
Retarded
Along circular tracks
Uniform
A man wearing a bullet-proof vest stands on roller skates. The total mass is 80 kg. A bullet of mass 20 g is fired at 400 m/s. It is stopped by the vest and falls to the ground. What is then the velocity of the man?
1 m/s
0.1 m/s
0.01 m/s
0 m/s
