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Physics -- Kinematics and Forces
16.
A particle of a small mass m is joined to a very heavy body by a
light string passing over a light pulley. Both bodies are free to
move. The total downward force on the pulley is
- A.mg
- B.2 mg
- C.4 mg
- D.>> mg
- Answer
- Report
Answer : [C]
17.
A uniform chain of mass m hangs from a light pulley, with
unequal lengths of the chain hanging from the two sides of the
pulley. The force exerted by the moving chain on the pulley is
- A.mg
- B.> mg
- C.< mg
- D.either (b) or (c) depending on the acceleration of the chain
- Answer
- Report
Answer : [C]
18.
Two blocks of masses m1 and m2 are placed in contact with each other on a horizontal platform. The coefficient of friction between the platform and the two blocks is the same. The platform moves with an acceleration. The force of interaction between the blocks is
- A.zero in all cases
- B.zero only if m1 = m2
- C.nonzero only if m1 > m2
- D.nonzero only if m1 < m2
- Answer
- Report
Answer : [A]
19.
In the figure, the blocks A, B and C of mass m each have accelerations a1, a2 and a3 respectively. F1 and F2 are external forces of magnitudes 2mg and mg respectively.
- A.a1 = a2 = a3
- B.a1 > a3 > a2
- C.a1 = a2, a2 > a3
- D.a1 > a2, a2 = a3
- Answer
- Report
Answer : [B]
20.
In the figure, the vertical sections of the string are long. A is released from rest from the position shown.
- A.The system will remain in equilibrium.
- B.The central block will move down continuously.
- C.The central block will undergo SHM.
- D.The central block will undergo periodic motion but not SHM.
- Answer
- Report
Answer : [D]
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