A rough vertical board has an acceleration ‘a’ so that a 2 kg block pressing against it does not fall. The coefficient of friction between the block and the board should be

(1) > g/a

(2) < g/a

(3) = g/a

(4) > a/g

Subtopic:  Friction |
 66%
From NCERT
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It is easier to draw up a wooden block along an smooth inclined plane than to haul it vertically, principally because 

(1) The friction is reduced

(2) The mass becomes smaller

(3) Only a part of the weight has to be overcome

(4) ‘g’ becomes smaller

Subtopic:  Friction |
 59%
From NCERT
PMT - 1977
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A lead ball strikes a wall and falls down, a tennis ball having the same mass and velocity strikes the wall and bounces back. Check the correct statement

(1) The momentum of the lead ball is greater than that of the tennis ball

(2) The lead ball suffers a greater change in momentum compared with the tennis ball

(3) The tennis ball suffers a greater change in momentum as compared with the lead ball

(4) Both suffer an equal change in momentum

Subtopic:  Application of Laws |
 68%
From NCERT
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A ball of weight 0.1 kg coming with speed 30 m/s strikes with a bat and returns in opposite direction with speed 40 m/s, then the impulse is (Taking final velocity as positive) 

(1) 0.1×(40)0.1×(30)

(2) 0.1×(40)0.1×(30)

(3) 0.1×(40)+0.1×(30)

(4) 0.1×(40)0.1×(20)

Subtopic:  Application of Laws |
 66%
From NCERT
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A ball of mass m falls vertically to the ground from a height h1 and rebound to a height h2. The change in momentum of the ball on striking the ground is 

(1) mg(h1h2)

(2) m2gh1+2gh2

(3) m2g(h1+h2)

(4) m2g(h1+h2)

Subtopic:  Application of Laws |
 74%
From NCERT
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Consider the following two statements

1. Linear momentum of a system of particles is zero

2. Kinetic energy of a system of particles is zero Then 

(1) 1 implies 2 and 2 implies 1

(2) 1 does not imply 2 and 2 does not imply 1

(3) 1 implies 2 but 2 does not imply 1

(4) 1 does not imply 2 but 2 implies 1

Subtopic:  Newton's Laws |
From NCERT
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An elevator and its load have a total mass of 800 kg .Find the tension in the supporting cable when the elevator, moving downward at 10 m/s is brought to rest with constant acceleration in a distance of 25 m. ( Take g = 10m/s2 ) :-

(1) 6400 N

(2) 8000 N

(3) 9600 N

(4) Zero

Subtopic:  Application of Laws |
From NCERT
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Two blocks A and B of masses 3m and m respectively are connected by a massless and inextensible string. The whole system is is suspended by a massless spring as shown in figure. the magnitudes of acceleration of A and B immediately after the string is cut, are respectively

1. g, g/3

2. g/3, g

3. g, g

4. g/3, g/3

 

 

Subtopic:  Spring Force |
 70%
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A car is negociating a curved road of radius R. The road is banked at angle θ. The coefficient of friction between the car and the road is μs. The maximum safe velocity on this road is 

(a)gRtanθ+μs1μstanθ 

(b) gRtanθ+μs1μstanθ

(c) gR2tanθ+μs1μstanθ

(d) gR2tanθ+μs1μstanθ

Subtopic:  Banking of Roads |
 83%
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A body of weight 50 N placed on a horizontal surface is just moved by a force of 28.2 N. The frictional force and the normal reaction are

(1) 10 N, 15 N

(2) 20 N, 30 N

(3) 2 N, 3 N

(4) 5 N, 6 N

Subtopic:  Friction |
 86%
From NCERT
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