Work-Energy Theorem NEET Questions

Physics - Work, Energy, and Power

Work-Energy Theorem MCQ Questions


7.
A particle moves under the influence of a force F = -kx. Starting from rest, its displacement as a function of time is best described by:

NEET - 2018

A.
Linear increase
B.
Parabolic increase
C.
Simple harmonic motion
D.
Exponential increase
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ANSWER :
C. Simple harmonic motion
8.
A body of mass 5 kg starts from rest and a net force of 20 N acts on it for 4 m. Final KE of the body is:
A.
20 J
B.
40 J
C.
80 J
D.
160 J
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ANSWER :
C. 80 J
9.
A body of mass 2 kg moving at 6 m/s is brought to rest by a braking force in 4 m. The braking force is:
A.
3 N
B.
4 N
C.
6 N
D.
9 N
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ANSWER :
D. 9 N
10.
A 10 kg block is pushed 5 m along a horizontal surface by a force of 40 N (µₖ = 0.2, g = 10 m/s²). Change in KE of the block is:
A.
200 J
B.
100 J
C.
50 J
D.
150 J
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ANSWER :
B. 100 J
11.

A particle of mass 0.5 kg moves in a straight line under the influence of a force that varies with position as F(x) = -4x N. If the particle starts from rest at x = 2 m, its speed when it reaches x = 0 is:

NEET - 2016

A.

5.66 m/s

B.

2 m/s

C.

8 m/s

D.

16 m/s

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ANSWER :

A. 5.66 m/s

12.
A body of mass m moving at speed u is brought to rest by a constant retarding force F in distance s. The relation between these quantities is:
A.
Fs = mu
B.
Fs = ½mu²
C.
Fs = 2mu²
D.
F = mu/s
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ANSWER :
B. Fs = ½mu²