Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-4>Q 15

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A toy car of mass $5 kg$ moves up a rampíunder the influence of force $F$ plotted against displacement $x .$ The maximum height attained is given by

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Important Questions on Work, Energy and Power

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-4>Q 16

Which of the following graphs is correct between kinetic energy (E), potential energy (U) and height (h) from the ground of the particle

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-4>Q 17

One end of a light spring of spring constant

k

is fixed to a wall and the other end is tied to a block placed on a smooth horizontal surface. In a displacement, the work done by the spring is

+ (\frac{1}{2}) {kx}^{2}

. The possible cases are

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-4>Q 18

If force is always perpendicular to motion

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-4>Q 19

Work done by force of friction

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-4>Q 20

A particle is taken from point

A

to point

B

under the influence of a force field. Now it is taken back from

B

to

A

and it is observed that the work done in taking the particle from

A

to

B

is not equal to the work done in taking it from

B

to

A .

If

W_{n c}

and

W_{c}

is the work done by non-conservative forces and conservative forces present in the system respectively,

Δ U

is the change in potential energy,

Δ K

is the change in kinetic energy, then

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Alpha Question Bank for Medical: Physics>Chapter 8 - Work, Energy and Power>Exercise-4>Q 21

A tennis ball is dropped on a horizontal smooth surface. It bounces back to its original position after hitting the surface The force on the ball during the collision is proportional to the length of compression of the ball. Which one of the following sketches describes the variation of its kinetic energy