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?

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Important Questions on Potential Energy, Kinetic Energy and Gravity

EASY
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
The energy possessed by an oscillating pendulum of a clock is _____.
EASY
The sum of potential and kinetic energy keeps on changing for any system.
EASY
A body is falling from a height h. After it has fallen a height h2, it will possess
EASY
Mechanical energy is of two types - potential energy and kinetic energy.
MEDIUM

A ball falls to the ground as shown below:

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What is the potential energy of the ball at B?

HARD

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

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 _____.

MEDIUM

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

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
Roller coaster ride is an example of transformation of energy between potential and kinetic energy.
MEDIUM
A mass m is used to compress a spring fixed on a high-rise platform. Then
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EASY
An object is falling freely from a height x. After it has fallen a height x2 , it will possess:
MEDIUM
From a building two balls A to B are thrown such that A is thrown upwards and B downwards (both vertically). If vA and vB are their respective velocities on reaching the ground, then
EASY

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?