Tag: force and newton's laws of motion

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Questions Related to force and newton's laws of motion

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

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

The acceleration produced in a body by a force of given magnitude depends on:

  1. size of the body

  2. shape of the body

  3. mass of the body

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

Newton's second law of motion, $F=ma$, where $m$ is mass of an object which acquires acceleration $a$ when force $F$ is applied on it.
For a force of constant magnitude, $a\propto{\dfrac{1}{m}}$ i.e. acceleration is inversely proportional to mass.

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

State whether given statement is True or False.
An object moving on a frictionless horizontal surface should move with constant velocity

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
True,
Newtons law of motion states that a body moving with constant velocity will continue moving with same velocity if any external force is absent. In the given case above case surface is frictionless and any other external force is absemt so body will move with same constant velocity.