Newtons Law of Motion

The rate of change of (a)   is directly proportional to the force applied on it.

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The 3 laws of Motion were formulated by

• Einstein

• Isaac Newton

• Heisenberg

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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

• 8 N

• 2 N

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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

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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

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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(a)

• Move backward

• Move forward

• Come to the rest

• Be unaffected

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Velocity versus time graph of a ball of mass 50 g rolling on a concrete floor is shown in the figure above.

What will be the frictional force of the floor on the ball?

(Hint: use formula of momentum)

• 1 N

• 0.1 N

• 100 N

• 1000 N

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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.

Which law can be used to explain this?

Answer:(a) Newton’s first law of motion

• 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

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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?

(Consider the units carefully)

• 15000 kg km/h

• 15000 kg m/s

• 54000 kg m/s

• 54000 g m/s

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