Work-Energy Theorem NEET Questions

Physics - Work, Energy, and Power
Work-Energy Theorem

Work-Energy Theorem MCQ Questions


1.
The work-energy theorem states that:
A.
Total energy of a body is always constant
B.
Change in kinetic energy of a body equals the work done on it by the net force
C.
Work done by a force equals force times time
D.
KE equals work done only when body starts from rest
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ANSWER :
B. Change in kinetic energy of a body equals the work done on it by the net force
2.
Mathematically, the work-energy theorem is expressed as:
A.
Kf + Ki = W_net
B.
Kf − Ki = W_net
C.
W_net = œmv²
D.
ΔK = −W_net
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ANSWER :
B. Kf − Ki = W_net
3.
The work-energy theorem for constant force is derived from:
A.
Conservation of momentum
B.
Newton's Second Law (F = ma) combined with kinematics (v² − u² = 2as)
C.
Conservation of energy
D.
Newton's Third Law
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ANSWER :
B. Newton's Second Law (F = ma) combined with kinematics (v² − u² = 2as)
4.
For 3-dimensional motion under constant force, the work-energy theorem is obtained by:
A.
Using conservation of momentum in 3D
B.
Using v² − u² = 2a·d (vector form), then multiplying by m/2 to get F·d = ΔKE
C.
Using v² − u² = 2as in x-direction only
D.
Integrating Newton's 2nd Law over time
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ANSWER :
B. Using v² − u² = 2a·d (vector form), then multiplying by m/2 to get F·d = ΔKE
5.
The work-energy theorem is related to Newton's Second Law in that:
A.
They are completely independent principles
B.
WE theorem is the vector form of Newton's 2nd Law
C.
WE theorem is the scalar (integral) form of Newton's 2nd Law — temporal information is integrated over
D.
WE theorem is more general than Newton's 2nd Law
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ANSWER :
C. WE theorem is the scalar (integral) form of Newton's 2nd Law — temporal information is integrated over
6.
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
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