Laws of Motion – SMART MOVE LEARNING

Course Content

Work Power & Energy

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Work Power Energy

Laws of Motion

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Laws of Motion

PHYSICS for NEET-UG

About Lesson

You will get 5 mins to solve 5 Questions.

LAWS OF MOTION

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1. A train is moving with velocity 20 m/sec. on this, dust is falling at the rate of 50 kg/min. The extra force required to move this train with constant velocity will be

166.6 N

16.66 N

1000 N

1200 N

Force, F = v × (dm/dt) = 20 × (50/60) = 16·66 N

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2. A string of negligible mass going over a clamped pulley of mass m supports a block of mass M as shown in the figure. The force on the pulley by the clamp is given by

√(M + m)² + M² g

√(M + m)² + m² g

√2 mg

√2 Mg

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3. A monkey of mass 20 kg is holding a vertical rope. The rope will not break when a mass of 25 kg is suspended from it but will break if the mass exceeds 25 kg. What is the maximum acceleration with which the monkey can climb up along the rope (g = 10 m/s²)

2·5 m/s²

10 m/s²

5 m/s²

25 m/s²

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4. If the tension in the cable of 1000 kg elevator is 1000 kg weight, the elevator

May be at rest or accelerating

Is accelerating downwards

May be at rest or in uniform motion

Is accelerating upwards

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5. A pulley fixed to the ceilling carries a string with blocks of mass m and 3 m attached to its ends. The masses of string and pulley are negligible. When the system is released, its centre of mass moves with what acceleration

﹣g/2

g/4

g/2

Your score is

The average score is 37%

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