Two stones of masses m and 2m are whirled in horizontal circles, the heavier one in a radius r/2 and the lighter one in radius r. The tangential speed of lighter stone is n times that of the value of heavier stone when they experience same centripetal forces. The value of n is

1. 2

2. 3

3. 4

4. 1

Subtopic:  Uniform Circular Motion |
 70%
From NCERT
NEET - 2015
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A system consists of three masses m1, m2 and m3 connected by a string passing over a pulley P. The mass m1 hangs freely and m2 and m3 are on a rough horizontal table (the coefficient of friction=μ) The pulley is frictionless and of negligible mass. The downward acceleration of mass m1, is (Assume,m1=m2=m3=m)


1. g(1-gμ)/9

2. 2gμ/3

3. g(1-2μ)/3

4. g(1-2μ)/2

Subtopic:  Friction |
 84%
From NCERT
NEET - 2014
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A balloon with mass m is descending down with an acceleration a (where a < g). How much mass should be removed from it so that it starts moving up with an acceleration a?

1. 2ma/g+a

2. 2ma/g-a

3. ma/g+a

4. ma/g-a

Subtopic:  Application of Laws |
 61%
From NCERT
NEET - 2014
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Three blocks with masses m, 2m and 3m are connected by strings, as shown in the figure. After an upward force, F is applied on block m, the masses move upward at constant speed v. What is the net force on the block of mass 2m? (g is the acceleration due to gravity)

1. Zero

2. 2mg

3. 3mg

4. 6mg

Subtopic:  Application of Laws |
 74%
From NCERT
NEET - 2013
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The upper half of an inclined plane of inclination θ is perfectly smooth while the lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom if the coefficient of friction between the block and lower half of the plane is given by

1. μ=1/tanθ

2. μ=2/tanθ

3. μ=2tanθ

4. μ=tanθ

Subtopic:  Friction |
 64%
From NCERT
NEET - 2013
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A car of mass \(m\) is moving on a level circular track of radius \(R\). If \(\mu_s\) represent the static friction between the road and tyres of the car, then the maximum speed of the car in circular motion is given by:

1. \(\sqrt{\mu_{s} mRg} \) 2. \(\sqrt{Rg / \mu_{s}}\)
3. \(\sqrt{mRg / \mu_{s}} \) 4. \(\sqrt{\mu_{s} {Rg}}\)
Subtopic:  Uniform Circular Motion |
 88%
From NCERT
NEET - 2012
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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

Subtopic:  Application of Laws |
 89%
From NCERT
NEET - 2011
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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

Subtopic:  Pseudo Force |
 78%
NEET - 2010
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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

Subtopic:  Uniform Circular Motion |
 66%
From NCERT
NEET - 2010
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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:

1. 30 ms-2 downwards                                      
2. 4 ms-2 upwards
3. 4 ms-2 downwards                                        
4. 14 ms-2 upwards

Subtopic:  Application of Laws |
 78%
From NCERT
NEET - 2009
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