Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

EASY

Earn 100

A toy car rolls down the inclined plane as shown in the above figure. It loops at the bottom. What is the relation between H and h?

Important Questions on Potential Energy, Kinetic Energy and Gravity

EASY

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

A marble P of mass m lies at rest on the edge of a perfectly horizontal surface of a table of height h, as shown in the figure. A second identical marble Q having same mass moving at a speed u strikes it perfectly elastically. The speed acquired by marble P after the collision is (In an elastic collision, momentum as well as kinetic energy are conserved)
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EASY

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

The energy possessed by an oscillating pendulum of a clock is _____.

EASY

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

The sum of potential and kinetic energy keeps on changing for any system.

EASY

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

A body is falling from a height

h

. After it has fallen a height

\frac{h}{2}

, it will possess

EASY

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

Mechanical energy is of two types - potential energy and kinetic energy.

MEDIUM

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

A ball falls to the ground as shown below:

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What is the potential energy of the ball at B?

EASY

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

Choose the odd one out giving reason.

HARD

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

Prove that the kinetic energy of a freely falling object on reaching the ground is nothing but the transformation of its initial potential energy.

EASY

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

The sum of the potential and kinetic energies of a body is called _____ energy.

EASY

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

The P.E. of a body at a certain height is $200 J .$ The kinetic energy possessed by it when it just touches the surface of the earth is _____.

EASY

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

The sum of kinetic and potential energy is called :

MEDIUM

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

The total energy of an object falling freely towards the ground _____.

(Choose from: decreases, remains unchanged, increases, increases in the beginning and then decreases)

MEDIUM

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

A ball falls to the ground as shown below:

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What is the kinetic energy of the ball when it hits the ground?

EASY

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

Roller coaster ride is an example of transformation of energy between potential and kinetic energy.

MEDIUM

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

What is meant by mechanical energy? Explain in detail.

MEDIUM

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

A mass

m

is used to compress a spring fixed on a high-rise platform. Then
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EASY

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

Give two examples of mechanical forces

EASY

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

An object is falling freely from a height

x

. After it has fallen a height

\frac{x}{2}

, it will possess:

MEDIUM

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

From a building two balls

A

to

B

are thrown such that

A

is thrown upwards and

B

downwards (both vertically). If

v_{A}

and

v_{B}

are their respective velocities on reaching the ground, then

EASY

Physical and Earth Science>Change>Potential Energy, Kinetic Energy and Gravity>Conservation of Energy

A ball falls to the ground as shown below:

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Which law can be used to calculate the potential and kinetic energy at point B and C, respectively?