Exercise: Engineering Mechanics

Questions for: Engineering Mechanics

For any system of coplaner forces, the condition of equilibrium is that the
A:
algebraic sum of the horizontal components of all the forces should be zero
B:
algebraic sum of the vertical components of all the forces should be zero
C:
algebraic sum of moments of all the forces about any point should be zero
D:
all of the above
Answer: D
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A force acting in the opposite direction to the motion of the body is called force of friction.
A:
Agree
B:
Disagree
C:
D:
Answer: A
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If a number of forces are acting at a point, their resultant is given by
A:
(∑V)2 + (∑H)2
B:
C:
(∑V)2 +(∑H)2 +2(∑V)(∑H)
D:
Answer: B
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The unit of angular velocity is
A:
m/min
B:
rad/s
C:
revolutions/min
D:
both (B) and (C)
Answer: D
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When a body of mass m attains a velocity v from rest in time t, then the kinetic energy of translation is
A:
mv2
B:
mgv2
C:
0.5 mv2
D:
0.5 mgv2
Answer: C
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