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Fictitious force is also known as _____.

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Important Questions on Work, Energy and Power

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Science>Physics>Work, Energy and Power>Work Energy Theorem

Assertion $(A)$ : The work done by the electrostatic force is zero when a point charge moves in a circular path around another charge.

Reason $(R)$ : The dot product of force and displacement vectors gives work done.

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

2 kg

mass lying on a table is displaced in the horizontal direction through

50

cm .

The work done by the normal reaction will be

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

If reaction is $R$ and coefficient of friction $μ_{r}$ what is the work done against friction in moving a body by distance $d$ ?

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EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

When a rubber string is stretched through a distance

x

, the restoring force developed has a magnitude

(p x + q x^{2} + r x^{3})

where

p, q

and

r

are constants. Work done in stretching the unstretched rubber string by a distance

l

, is

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

Two springs of spring constants

K

and

2 K

are stretched by same force. If

W_{1}

and

W_{2}

are the energies stored in them respectively then

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

A force

F = 20 + 10 y

acts on a particle in

y

-direction where

F

is in Newton and

y

is in meter. Work done by this force to move the particle from

y = 0

y = 1 m

HARD

Science>Physics>Work, Energy and Power>Work Energy Theorem

A force

(F) = - 5 \hat{i} - 7 \hat{j} + 3 \hat{k}

acting on a particle causes a displacement

(s) = 3 \hat{i} + 2 \hat{j} + a \hat{k}

in its own direction. If the work done is

14 J

, then the value of

a

is:

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

A particle moves from a point

(- 2 \hat{i} + 5 \hat{j})

(4 \hat{j} + 3 \hat{k})

when a force of

(4 \hat{i} + 3 \hat{j}) N

is applied. How much work has been done by the force?

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

Work done during raising a box on to a platform with constant force

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

A truck and a car moving with the same kinetic energy are brought to rest by the application of brakes which provides equal retarding force. Which of them will come to rest in a shorter distance?

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

A force of

0.5 N

is applied on the upper block as shown in the figure. Find the work done by a lower block on the upper block for a displacement

3 m

of the upper block. (Take

g = 10 m s^{- 2}

)

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

A body moves from a position

r_{1} = (2 \hat{i} - 3 \hat{j} - 4 \hat{k}) m

to a position

r_{2} = (3 \hat{i} - 4 \hat{j} + 5 \hat{k}) m

under the influence of a constant force

F = (4 \hat{i} + \hat{j} + 6 \hat{k}) N

. The work done by the force is

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

A bullet of mass

m

fired at

30 °

to the horizontal leaves the barrel of the gun with a velocity

v

. Then bullet hits a soft target at a height

h

above the ground. While it is moving downward it hits the target and emerges out with half the kinetic energy it had before hitting the target. Which of the following statements is correct with respect to the bullet after it emerges out of the target?

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

A body of mass

10 kg

is moving on a horizontal surface by applying a force of

10 N

in forward direction. If body moves with constant velocity. Find the work done by applied force for a displacement of

2 m

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

According to work-energy theorem, the work done by the net force on a particle is equal to the change in its

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

An observer and a vehicle, both start moving together from rest (towards right) with acceleration

5 m s^{- 2}

and

2 m s^{- 2}

, respectively. There is a

2 kg

block on the floor of the vehicle and co-efficient of friction is

μ = 0.3

between their surfaces. Then the work done by frictional force on the

2 kg

block observed by the running observer, during first

2

seconds of the motion,
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EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

A charge of $2 C$ moves between two plates, maintained at a potential difference of $1 V .$ What is the energy acquired by the charge?

EASY

Science>Physics>Work, Energy and Power>Work Energy Theorem

A truck and a car are moving with same kinetic energy. Both are brought to rest by applying the same retarding force.

S_{1}

is the distance travelled by truck before coming to rest and

S_{2}

is the distance travelled by the car before coming to rest.

MEDIUM

Science>Physics>Work, Energy and Power>Work Energy Theorem

An object of

40 kg

mass is moving with

5 \frac{m}{s}

velocity. Now force is applied on the object such that its velocity increases to

10 \frac{m}{s}

. Calculate the work done by the force in joules.

MEDIUM

Science>Physics>Work, Energy and Power>Work Energy Theorem

A variable force acts on body of mass

1 kg

and it changes the velocity of the body from

2 m / s

6 m / s

. Find the work done (in

joule

) on the body by the variable force.

Fictitious force is also known as _____.

Important Questions on Work, Energy and Power

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