Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 156

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The correct diagram for the work done in moving a body from $A$ to $B$ under the action of variable force is,

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Important Questions on Laws of Motion

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 157

In a gravitational force field a particle is taken from $A$ to $B$ along different paths as shown in figure. Then

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 158

The force acting on a particle moving in a straight line varies with the velocity of the particle

v

as,

F = \frac{K}{v}

, where

K

is a constant. The work done by this force in time

t

is

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 159

A body of mass

6 kg

is under a force which causes displacement in it given by,

s = \frac{t^{2}}{4} m

, where

t

is time. The work done by the force in

2 \sec

is,

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 160

A time-dependent force,

F = 6 t

N

acts on a particle of mass

1 kg

. If the particle starts from rest, the work done by the force during the first

1

sec will be,

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 161

A ball (initially at rest) is released from the top of a tower. The ratio of work done by the force of gravity in the first, second and third seconds is,

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 162

If

μ, N

and

S

represent coefficient of friction, normal reaction and distance moved, then the general expression for work against friction is

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 163

Assertion: Friction is a conservative force.
Reason: Friction does not depend upon mass of the body.

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Physics Crash Course MHT-CET>Chapter 2 - Laws of Motion>Exercise 1>Q 164

A

60 kg

weight is dragged on a horizontal surface by a rope up to

2 m

. If the coefficient of friction is

μ = 0.5,

the angle of rope with the surface is

60 °

and

g = 9.8 m s^{- 2},

then, work done is