Tag: newton's first law of motion

Questions Related to newton's first law of motion

Physical independence of force is a consequence of 

physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

  1. First law of motion

  2. Second law of motion

  3. Third law of motion

  4. All of these laws

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Correct Option: A
Explanation:

Physical independence of force is a consequence of first law of motion.

Mark the correct option

physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

  1. The state of motion of an object is described by its speed only

  2. Many a time application of force does not result in a change in the state of motion of an object

  3. By sitting on a bicycle seat force is applied to the spring fixed to the seat of a bicycle

  4. All of the above

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Correct Option: D
Explanation:
$(i)$ option $A$ is correct, as if to know about the unifomity of a motion and the body is moving or not speed is used as the parameter
$(ii)$Option B is correct, as the acceleration of a body depends on the net force a applied not on single $10r$ individual forces.
$(iii)$ Option $C$ is correct, while sifting on the bicycle, the spring force allached to the seat balances weight.
Option $D$ 

Consider the following statements
I) When a body is travelling with uniform speed, no force is acting on it.
II) When a body is travelling with constant velocity, no force is acting on it.
Which of the above statements is/are true?

physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

  1. only I

  2. only II

  3. both I and II

  4. neither I nor II

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Correct Option: A

Newton's law of motion cannot be applicable to the particle moving at a speed comparable to the speed of

physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

  1. $Light$

  2. $Sound$

  3. $Rocket$

  4. $Bullet train$

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Correct Option: A
Explanation:

Newton's law of motion are applicable for matter which occupy some space and have some mass. It is not possible for any matter to travel with speed of light. Secondly the mass charges as the speed approaches speed of light. Newton's law is applicable only when mass is constant so light is correct option.

Inertia of a body directly depends on its :

physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

  1. Velocity

  2. Mass

  3. Area

  4. None of the above

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Correct Option: B
Explanation:

Inertia of body directly depends on its mass.

The correct option is B. 

Choose the correct statement(s)

physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

  1. Motion necessarily takes place along the direction of force

  2. If no force acts, the body is at rest

  3. A body in motion, need not be acted upon by a force

  4. A change in speed is always there, whenever a force is applied on the moving body

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Correct Option: C
Explanation:

Motion always takes place along velocity of the body.So it does not necessarily takes place along the direction of force.
When a body moves with uniform velocity , there is no force acting on the body. So option B is incorrect and C is correct.
We know that magnetic force does not do work. It can change the direction of motion but never change the speed. So option D is incorrect.

Hair of shaving brush cling together when it is removed from water due to

physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

  1. Force of attraction between hair

  2. Surface tension

  3. Viscosity of water

  4. Charactersitic property of hair

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Correct Option: B
Explanation:

When the brush is taken out of water, the hairs cling together due to surface tension. This happens because the free surface of water tries to acquire a minimum surface area.

Hence, option B is correct.

Which of the following Newton's law(s) is/are not applicable in non-inertial reference frame. 

physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

  1. Newton's first law

  2. Newton's second law

  3. Newton's third law

  4. All of these

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Correct Option: A
Explanation:

Newton's law(s) is/are not applicable in non-inertial reference frame in newton's first law.

so the option is A.

Is force needed to keep a moving body in motion? Which one of the Newton's laws follow this ?

physics force and newton's laws of motion first law of motion newton's first law of motion momentum and newton's laws

  1. No, first law.

  2. Yes, third law.

  3. No, second law

  4. Yes, first law.

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Correct Option: A
Explanation:

No, force is not needed to keep a moving body in motion. This is according to Newton's first law of motion.

A ball moving on a table top eventually stops. What is the reason ?

momentum and newton's laws newton's first law of motion first law of motion force and newton's laws of motion physics

  1. due to gravity.

  2. due to friction between the ball and table

  3. due to other external force.

  4. none of these.

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Correct Option: B
Explanation:

Due to the force of friction between the ball and table top, it  opposes the motion of the ball. And, gradually its speed keeps on decreasing and the ball finally stops.