Tag: force and newton's laws of motion

Quizzes (10) Questions (223)

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

An object moving at constant velocity must:

  1. have a net force on it

  2. eventually stop due to gravity

  3. not have any force of gravity on it

  4. have zero net force on it
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The object moving with constant velocity must have zero acceleration i.e. $a _{net} = 0$. From Newton's IInd law the net external force must be zero in case of zero acceleration.

Net external force acting on the object  $F _{net} = ma _{net} = 0$
Hence answer D 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

Every body continues to be in its state of rest or of non-uniform motion in a straight line unless compelled by some external force to act otherwise. This is stated by:

  1. Newton's 1st law

  2. Newton's 2nd law

  3. Newton's 3rd law

  4. None of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The premise of question is external force is zero and conclusion is  state of motion of body will be at rest or non uniform motion. However, the non uniform motion is only applicable in case of external force being applied to body, hence the statement is false.

So, given statement is stated by none of Newton's laws.

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

If there are many forces acting on an object, it must have a non-zero net (unbalanced) force acting on it.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

In case of many forces acting on the body, it can be in equilibrium,which implies zero external force. For example in case of ladder supported by a wall there are frictional and gravitational forces working at wall and floor, which balances each other so that ladder does not move. Hence the given statement is false.

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.
Is it possible to move in a curved path in the absence of a force?

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Any curve path can be assumed as summation if small circular arcs  of different radii. For a path to move at circular arc, there must be some force to provide it centripetal force to remain it in circular path. It is not possible to have motion along curved path without any force.

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

Consider a ball at rest in the middle of a toy wagon. When the wagon is pulled forward, the ball:

  1. Rolls forward

  2. Stays stationary

  3. Rolls sidewards

  4. Rolls backwards
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The relative motion between ball and toy wagon is zero before being pulled. As the wagon is pulled, the inertia of ball causes ball to maintain its state of rest, so the ball rolls backwards when wagon is moved in forward direction.

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.
You fall in the forward direction when a moving bus applies brakes to stop, and fall backward when it accelerates from rest.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In a moving bus, passengers are in motion along with bus. When brakesare applied to stop a moving bus, bus comes in the position of rest. But because of tendency to be in the motion a person falls in forward direction.Similarly, when a bus is accelerated from rest, the tendency to be in rest, a person in the bus falls backwards.

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

It is advised to tie any luggage kept on the roof of a bus with a rope because of :

  1. Newtons first law

  2. Newtons second law

  3. Newtons third law

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

Luggage kept on the roof of a bus has the tendency to maintain its state of rest when bus is in rest and to maintain the state of motion when bus is in motion according to Newtons First Law of Motion. When bus will come in motion from its state of rest, in order to maintain the position of rest, luggage kept over its roof may fall down(backward). Similarly, when a moving bus will come in the state of rest or there is any sudden change in velocity because of applying of brake, luggage may fall down(forward) because of its tendency to remain in the state of motion.
This is the cause that it is advised to tie any luggage kept on the roof a bus with a rope so that luggage can be prevented from falling down.