Tag: physics

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Questions Related to physics

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

Choose the correct statement(s)

  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
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

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

  1. Force of attraction between hair

  2. Surface tension

  3. Viscosity of water

  4. Charactersitic property of hair
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. due to gravity.

  2. due to friction between the ball and table

  3. due to other external force.

  4. none of these.
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Object will remain at rest or in uniform motion in a straight line unless acted upon by an external force - which law is this ?

  1. Newton's third law

  2. Newton's first law

  3. Newton's second law

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Statement of Newton's first law of motion,

It states that a body will remain at rest or in state of motion unless an external force is applied to the object.
To have any changes in state of object , force is necessary.

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

An aeroplane of mass is moving uniformly at a constant height under the action of two forces (i) upward force (lift) and (ii) downward force (weight). What is the net force on the aeroplane.

  1. Zero.

  2. mg

  3. only downward force

  4. only upward force
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

If the net force is not zero the plane would be moving upward or downward. Since its height is constant the net force is 0