Tag: physics

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Questions Related to physics

Multiple choice physics force and newton's laws of motion momentum (p) introduction to momentum linear momentum

A car and a lorry are moving with same momentum, if same braking force is applied, then :

  1. Car comes to rest in shorter distance.

  2. Lorry comes to rest in shorter distance.

  3. Both travels same distance before coming to rest.

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

A car and a lorry are moving with same momentum, if same breaking force is applied, then lorry comes to rest in shorter distance as it has greater mass so moves with less velocity.

Multiple choice physics force and newton's laws of motion momentum (p) introduction to momentum linear momentum

Which of the following statements are true?

  1. When the mass of a body is doubled then the momentum of a body is also doubled, provided the body maintains the same velocity.

  2. We feel pain in the hand on hitting the wall, this is a consequence of Newton's third law of motion.

  3. A table cloth can be pulled from a table without dislodging the dishes. This is due to inertia of rest.

  4. Momentum is a vector quantity.
Reveal answer Fill a bubble to check yourself
A,B,C,D Correct answer
Explanation

Option A is correct .

as P = mv,
So $ P \space \alpha \space m $ if v is constant.


Option B is correct.
The pain in hand is due to reaction from the wall. It will be same in magnitude as that of applied force according to Newton's third law, for every action, there is an equal and opposite reaction.


Option C is correct.
When table cloth is pulled very fast, due to inertia dishes does not change its state. 

Option 4 is correct.
P = mv
as v (velocity) is vector, momentum is also vector.

Multiple choice physics force and newton's laws of motion momentum (p) introduction to momentum linear momentum

Which of the following statements are correct regarding linear momentum of a body?

  1. It is a measure of quantity of motion contained by the body.

  2. Change in momentum is the measurement of impulse.

  3. Impulse and acceleration act in same direction to the change in momentum.

  4. Incase of uniform circular motion, the linear momentum is conserved.
Reveal answer Fill a bubble to check yourself
A,B Correct answer
Explanation

Momentum, P = Mv

So, it gives quantity of motion. Option A is correct.
By Newton's second law,
Ft = mv-mu, So option B is correct.
The direction of impulse can be opposite to that of change in momentum. Option C is wrong.
The Uniform circular motion is accelerated motion. So, momentum is not conserved.
Option D is wrong.
Hence, Options A and B are correct.