A car of mass m is moving on a level circular

track of radius R. If μs represent the static friction 

between the road and tyres of the car, the maximum

speed of the car in circular motion is given by

(a) μsmRg               (b) Rg/μs

(c) mRg/μs             (d) μsRg

Concept Questions :-

Uniform circular motion
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A particle moves in a circle of radius 5 cm

with constant speed and time period 0.2 πs.

The acceleration of the particle is

(a) 25 m/s2

(b) 36 m/s2

(c) 5 m/s2

(d) 15 m/s2

Concept Questions :-

Uniform circular motion
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A person of mass 60 kg is inside a lift of mass

940 kg and presses the button on control 

panel. The lift starts moving upwards with an

acceleration 1.0 m/s2. If g=10 m/s2, the tension 

in the supporting cable is 

1. 9680 N

2. 11000 N

3.  1200 N

4. 8600 N

Concept Questions :-

Types of forces
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A conveyor belt is moving at a constant speed of 2 m/s. A box is gently dropped on it. The coefficient of friction between them is μ=0.5. The distance that the box will move relative to the belt before coming to rest on it taking g=10 ms-2, is 

1. 1.2 m                                            2. 0.6 m

3. zero                                               4. 0.4 m

Concept Questions :-

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A block of mass m is in contact with the cart C as shown in the figure.

The coefficient of static friction between the block and the cart is μ.The acceleration α of the cart that will prevent the block from falling satisfies

1. α>mgμ                                       2. α>gμm

3. αgμ                                          4. α<gμ

Concept Questions :-

Pseudo force
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A gramophone record is revolving with an angular velocity ω. A coin is placed at a distance r from the centre of the record. The static coefficient of friction is μ. The coin will revolve with the record if 

1. r=μgω2                                       2. r<ω2μg

3. rμgω2                                         4. rμgω2

Concept Questions :-

Uniform circular motion
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The mass of a lift is 2000 kg. When the tension in the supporting cable is 28000 N, its acceleration is

(a) 30 ms-2 downwards                                       (b) 4 ms-2 upwards

(c) 4 ms-2 downwards                                         (d) 14 ms-2 upwards

Concept Questions :-

Types of forces
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A body, under the action of a force F=6i^-8j^+10k^, acquires an acceleration of 1ms-2. The mass of this body must be

(a) 2010kg                                   (b) 10kg

(c) 20kg                                          (d) 102kg                                

Concept Questions :-

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A roller coaster is designed such that riders experience "weightlessness" as they go round the top of a hill whose radius of curvature is 20m. The speed of the car at the top of the hill is between

1. 14m/s and 15m/s

2. 15m/s and 16m/s

3. 16m/s and 17m/s

4. 13m/s and 14m/s

Concept Questions :-

Non-Uniform vertical circular motion
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Three forces acting on a body are shown in the figure.To have the resultant force only along the y-direction, the magnitude of the minimum additional force needed is 

(a)0.5N

(b)1.5N

(c)34 N

(d) 3N

Concept Questions :-

Application of laws
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