Physics
Work and Energy
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#9 Gravitational potential energy near Earth’s surface:
A) $U=mgh$
B) $U=mg/v$
C) $U=\tfrac12 mv^2$
D) $U=Fx$
#10 Elastic potential energy in a spring:
A) $U=\tfrac12 kx^2$
B) $U=kx$
C) $U=\tfrac12 mv^2$
D) $U=mgx$
#11 Work–energy theorem states:
A) Net work equals change in kinetic energy
B) Power equals work
C) Momentum equals work
D) Force equals energy
#12 If net work on a particle is zero, its speed:
A) remains unchanged
B) must be zero
C) increases
D) decreases
#13 For a conservative force, work done around a closed path is:
A) zero
B) positive
C) negative
D) maximum
#14 Friction is a:
A) non-conservative force
B) conservative force
C) central force
D) field force only
#15 Potential energy is defined only for:
A) conservative forces
B) non-conservative forces
C) impulsive forces
D) random forces
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