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Chapter 5 - Circular Motion - 1
1.
The angular acceleration of a body experiencing torque is directed:-
a) away from the centre of the circle.
b) along the tangent to the circle.
c) towards the centre of the circle.
d) along the axis of rotation.
2.
The acceleration of a freely falling body is:-
a) Positive 9.8 m / s
2
b) Zero m / s
2
c) 19.6 m /s
2
d) Negative 9.8 m / s
2
3.
Torque is produced by a force which is directed:-
a) along the tangent to the circle
b) towards the centre
c) None of the above.
d) along the axis of rotation.
4.
Angular acceleration is produced when the body is moving with:-
a) Variable velocity in a straight line.
b) Accelerated circular motion.
c) Uniform circular motion.
d) Constant speed in a circle.
5.
An elevator is moving upward with an acceleration "a" the apparent weight of a body of mass m in the elevator will be:-
a) equal to m (g-a)
b) equal to m (g+a)
c) equal to ma
d) equal to mg
6.
The orbital velocity of a satellite orbiting around the earth is directly proportional to:-
a) the radius of the orbit "r".
b) square root of the 1 / "r"
c) square root of the radius r.
d) the 1/ "r" of the orbit
7.
A body moving counter clock-wise when slows down its angular acceleration will be:-
a) directed anticlock-wise.
b) directed clock-wise.
c) directed away from us.
d) directed towards us.
8.
The rotational kinetic energy of a loops of mass m moving down an inclined plane with velocity V will be:-
a) 1/2 mv
2
b) 3/4 mv
2
c) 1/4 mv
2
d) 4/3 mv
2
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