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During inelastic collision between two objects, which of the following quantity always remains conserved?

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Important Questions on Work, Energy and Power

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Physics Crash Course NEET>Chapter 4 - Work, Energy and Power>Level 1>Q 61

A particle is moving in a vertical circle. The tensions in the string when passing through two positions at angles

30 °

and

60 °

from vertical (lowest position) are

T_{1}

and

T_{2}

respectively then

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Physics Crash Course NEET>Chapter 4 - Work, Energy and Power>Level 1>Q 62

If the overbridge is concave instead of being convex, the thrust on the road at the lowest position will be,

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Physics Crash Course NEET>Chapter 4 - Work, Energy and Power>Level 1>Q 63

A mass

m

is attached to the end of a rod of length

l

. The mass goes along a vertical circular path with the other end hinged at its centre. What should be the minimum velocity of the mass at the bottom of the circle so that the mass completes the circle?

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Physics Crash Course NEET>Chapter 4 - Work, Energy and Power>Level 1>Q 64

A stone is tied to a string of length '

l

' and is whirled in a vertical circle with the other end of the string as the centre. At a certain instant of time, the stone is at its lowest position and has a speed '

u

'. The magnitude of the change in velocity as it reaches a position where the string is horizontal (g being acceleration due to gravity) is :-

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Physics Crash Course NEET>Chapter 4 - Work, Energy and Power>Level 2>Q 1

A body starts from rest with uniform acceleration and acquires a velocity

V

in time

T .

The instantaneous kinetic energy of the body after any time

t

is proportional to:

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Physics Crash Course NEET>Chapter 4 - Work, Energy and Power>Level 2>Q 2

Two balls of the same mass are dropped from the same height onto the floor. The first ball bounces upwards from the floor elastically. The second ball sticks to the floor. The first applies an impulse to the floor of

I_{1},

the second applies an impulse

I_{2}

(for the duration of collision). Then the relation between both the impulses is,

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Physics Crash Course NEET>Chapter 4 - Work, Energy and Power>Level 2>Q 3

For a particle moving in a vertical circle,

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Physics Crash Course NEET>Chapter 4 - Work, Energy and Power>Level 2>Q 4

A force,

\vec{F} = - k (y \hat{i} + x \hat{j})

where,

k

is a positive constant, acts on a particle moving in the

x - y

plane. Starting from the origin, the particle is taken along the positive

x

-axis to the point

(a, 0)

and parallel to the

y

-axis to the point

(a, a)

. The total work done by the force

\vec{F}

on the particle is,

During inelastic collision between two objects, which of the following quantity always remains conserved?

Important Questions on Work, Energy and Power

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