Question # 1

A ball with initial momentum p its a solid wall and bounces back with the same velocity. Its momentum p after collision will be.

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P' = p

P' = - P

P' = 2P

P' =-2P

An object of mass 1 kg placed at earth's surface experience a force of.

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1 N

9.8 N

100 N

Any Value

N kg-1 is equivalent to

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m s-1

m s-2

k g ms-1

kg m s-2

A particle of mass m moving with a velocity v collides with another particle of the same mass at rest. The velocity of the first particle after collision is.

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0

v

-p

- 1/2

A force acts on a boyd for 2 seconds and it produces 50 kg m/s chagne in its momentum. The force acting on the body

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25 N

100 N

2 N

50 N

Conservation of Linear momentum is equivalent to.

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Newton's Firs law of motion

Newton's second law of motion

Newton's third law of motion

None of these

The rate of change of momentum of free falling body is equal to its.

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Size

Velocity

Weight

Momentum

A large force acts on an objet for a very short interval of time. In the case, it is easy to determine.

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Magnitude of force

Time interveal

Product of force and time

None of these

What we kick a stone, we get hurt This is due to

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Inertia

Momentum

Reaction

Velocity

Change in momentum of a body is equal to

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Force Velocity

Force Time

Mass time

Force

A lubricant is usually introduced between two surfaces to decresses friction. The lubricant.

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Decreases temperture

Provides rolling friction

Prevents direct contact of the sturaces

Acts as ball bearings

Net force n the body falling in air with uniform velicyt is equl to.

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Zero

Weight of the body

Are resistance on the body

Difference of weight of body and air resistance on it.

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Physics 9th Class English Medium Unit 3 Online Test MCQs With Answers

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