Physics · JEE

The potential energy of a spring, conservation of mechanical energy, conservative and non-conservative forces Mock Test for JEE

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Syllabus context

Part of Work, Energy and Power in JEE Main Physics.

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Q1PhysicsUnit 4: Work, Energy and Power

A wire suspended vertically from one of its ends is stretched by attaching a weight of

200 \mathrm{N}

to the lower end. The weight stretches the wire by 1 mm. Then the energy stored in the wire is

Q2PhysicsUnit 4: Work, Energy and Power

The potential energy of a system increases if work is done:

Q3PhysicsUnit 4: Work, Energy and Power

A spring with spring constants K when compressed by

1 \mathrm{cm}

, the potential energy stored is U.If it is further compressed by

3 \mathrm{cm},

then its final potential energy is

Q4PhysicsUnit 4: Work, Energy and Power

Two springs of force constants

\mathbf{1 0 0 0} N / \boldsymbol{m}

and

\mathbf{2 0 0 0} \boldsymbol{N} / \boldsymbol{m}

are stretched by same force. The ratio of their respective potential energies is

Q5PhysicsUnit 4: Work, Energy and Power

Assertion Graph between potential energy of a spring versus the extension or compression of the spring is a straight line Reason Potential energy of a stretched or compressed spring is proportional to square of extension or compression

Q6PhysicsUnit 4: Work, Energy and Power

Which quantity of a two particles system depend only on the separation between the two particles?

Q7PhysicsUnit 4: Work, Energy and Power

A spring is kept compressed by a toy car of mass

150 g .

On releasing the car it moves with a speed of

0.2 m s^{-1} .

So, the elastic potential energy of the spring is

Q8PhysicsUnit 4: Work, Energy and Power

A car of mass

1000 \mathrm{kg}

moving with a speed

18 k m h^{-1}

on a smooth road and colliding with a horizontally mounted spring of spring constnat

6.25 \times

10^{3} N m^{-1} .

The maximum compression of the spring is

Q9PhysicsUnit 4: Work, Energy and Power

An ideal spring is hung vertically from the ceiling. When a

2.0 k g

mass hangs at rest from the spring is extended

6.0 \mathrm{cm}

from its relaxed length. downward external force is now applied to the mass to extend the spring an additional 10cm. While the spring is being extended by the force, the work done by the spring is:

Q10PhysicsUnit 4: Work, Energy and Power

A single conservative force

F(x)

acts on a

1.0-k g

particle that moves along the x-axis. The potential energy

U(x)

\operatorname{given} \operatorname{by} U(x)=20+(x-2)^{2}

where

x

is in meters. At

\boldsymbol{x}=\mathbf{5 . 0} \mathrm{m},

the particle has a kinetic energy of 20 J.What is the mechanical energy of the system?

Q11PhysicsUnit 4: Work, Energy and Power

Two spherical balls of the same radius but of different masses, are dropped at the same time from the top of a tower 19.6m high. When they are

1.6 \mathrm{m}

above the ground, the balls will possess the same

Q12PhysicsUnit 4: Work, Energy and Power

A body is dropped from a certain height from the ground. When it is halfway down, it possess,

Q13PhysicsUnit 4: Work, Energy and Power

A bullet of mass

\mathrm{m}

is fired from a gun of mass M. The recoiling gun compresses a spring of force constant k by a distance d. Then the velocity of the bullet is :

Q14PhysicsUnit 4: Work, Energy and Power

Which statement best represents the principle of conservation of energy?

Q15PhysicsUnit 4: Work, Energy and Power

If both the objects have the same PE curve as shown in the figure, then

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