Advertisements
Advertisements
Question
A pendulum is oscillating on either side of its rest position. The correct statement is:
Options
It has only the kinetic energy at its each position.
It has the maximum kinetic energy at its extreme position.
It has the maximum potential energy at its mean position.
The sum of its kinetic and potential energy remains constant throughout the motion.
Advertisements
Solution
The sum of its kinetic and potential energy remains constant throughout the motion.
Explanation:
In accordance with the law of conservation of mechanical energy, whenever there is an interchange between potential energy and kinetic energy, the total mechanical energy remains constant.
APPEARS IN
RELATED QUESTIONS
Does the transfer of energy take place when you push a huge rock with all your might and fail to move it? Where is the energy you spend going?
State the condition under which the mechanical energy is conserved.
A stone of mass 500 g is thrown vertically upwards with a velocity of 15 m/s. Calculate:
- the potential energy at the greatest height,
- the kinetic energy on reaching the ground, and
- the total energy at its half-way point.
Is energy a vector quantity?
Name the device which converts electrical energy into mechanical energy.
Name the device or machine which convert :
Chemical energy into electrical energy.
Name the device or machine which convert :
Electrical energy into heat energy.
Name the device or machine which convert :
Light energy into electrical energy.
Explain the transformation of energy in the following cases :
(i) A ball thrown upwards.
(ii) A stone dropped from the roof of a building.
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 m s–2)
