1. If when a body is disturbed from its original position it falls away, then the body is said to be in ____________ equilibrium.
A. stable
B. neutral
C. unstable
D. dynamic

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2. If when a body is disturbed from its original position it stays where it is placed, then the body is said to be in ____________ equilibrium.
A. Neutral
B. Dynamic
C. Unstable
D. Stable

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3. If when a body is disturbed from its original position it returns to its original position then it is in ____________ equilibrium.
A. Unstable
B. None of these
C. Stable
D. Neutral

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4. Every point on a rotating body has the same?
A. Angular velocity.
B. Linear momentum.
C. Linear acceleration.
D. Linear velocity.

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5. The angular momentum of the body is conserved if the net external torque on it is?
A. unity
B. maximum
C. zero
D. minimum

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6. A body possesses linear velocity and linear momentum when it is in
A. translatory motion.
B. spin motion.
C. rotatory motion.
D. orbital motion.

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7. The second condition of equilibrium states that, “a body will be in equilibrium, if the vector sum of all the torques acting on it is
A. maximum
B. unit
C. zero
D. minimum

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8. The perpendicular distance between the point of application of force and the fixed point or axis of rotation is called
A. momentum
B. moment arm
C. moment of inertia
D. centre of mass

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9. When the net torque acting on a system is zero, which of the following will be constant?
A. linear momentum
B. force
C. angular momentum
D. linear acceleration

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10. A body in equilibrium does not possess any
A. velocity
B. speed
C. acceleration
D. momentum

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11. In an equilibrium problem, the point about which torques are calculated
A. must pass through one end of the object
B. must pass through the objects center of mass
C. must intersect the line of action of at least one force acting on the object
D. may be located anywhere

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12. A spoon is suspended by a nail through a hole in its handle and is free to rotate. The spoon in the diagram on the left is
A. stable equilibrium
B. neutral equilibrium
C. unstable equilibrium
D. dynamic equilibrium

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13. A narrow plank balanced on end is in
A. stable equilibrium
B. neutral equilibrium
C. unstable equilibrium
D. dynamic equilibrium

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14. The metre rule above balances freely on a nail placed through a hole at the 50cm mark. Where should a 0.4N mass be hung so that the rule will balance whne a 0.2N is hung at the 30cm mark?
A.
B.
C.
D.

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15. If the sum of the torques on an object in equilibrium is zero about a certain point, it is
A. always zero about all other points
B. not always zero about some other points
C. not zero about any other point
D. depending upon the situation can be any of the above

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16. An object in equilibrium must not have
A. any acceleration
B. any unbalanced force acting on it
C. any torques acting on it
D. all of the above

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17. An inverted funnel placed on a table is in
A. unstable equilibrium
B. neutral equilibrium
C. stable equilibrium
D. dynamic equilibrium

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18. A pendulum at rest is in
A. unstable equilibrium
B. neutral equilibrium
C. stable equilibrium
D. dynamic equilibrium

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19. A sphere that is at rest on a table is in
A. unstable equilibrium
B. neutral equilibrium
C. stable equilibrium
D. dynamic equilibrium

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20. A gymnast whose weight is 500 N hangs from the middle of a bar supported by two vertical strands of rope. What is the tension in each strand? a. . b. . c. . d. .
A. 0 N
B. 250 N
C. 500 N
D. 1000 N

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21. A painter, who weighs 375 N, stands on a scaffold which weighs 420 N. If the tension in the right rope is 450N, what is the tension in the left rope? a. c. b. d.
A. 1245 N
B. 450 N
C. 405 N
D. 345 N

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22. Racing cars need a high degree of stability when turning bends on the race track. Which of the following features of these racing cars contribute to this stability?
A. They are usually painted in bright colours
B. They can go from 0 to 160 km per hour in about six seconds
C. Their wheels have a wide base
D. The driver has personal protective gear.

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23. Each of the glasses above has the same amount of liquid. Which is the most stable?
A.
B.
C.
D.

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24. A uniform plank is 6.0 m long and weighs 80 N. It is balanced on a sawhorse at its center. An additional 160 N weight is now placed on the left end of the plank. To keep the plank balanced, what distance must it be moved to the right?
A. 6.0 m
B. 2.0 m
C. 1.5 m
D. 1.0 m

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25. If an object is in unstable equilibrium, any displacement will
A. raise its center of gravity
B. increase its mass
C. neither raise nor lower its center of gravity
D. lower its center of gravity