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CNMS ICSE - 7 Std
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Chapter: 03. Energy

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What is the mathematical relationship between work, force, and displacement?
Work is calculated as the product of the force applied to a body and the displacement of the body in the direction of that force.
What is the definition of one joule of work?
One joule of work is done when a force of 1 newton displaces a body through a distance of 1 metre in the direction of the force.
How does the energy of a body change when work is done on it?
When work is done on a body, the energy of that body increases.
Define mechanical energy.
Mechanical energy is the energy acquired by an object by virtue of its position or its state of motion.
What are the two main factors that determine the kinetic energy of a moving object?
The kinetic energy of a moving object depends on the mass of the object and the speed at which it is moving.
Why does a stretched rubber band possess potential energy?
A stretched rubber band possesses potential energy because work is done on it to change its shape against its natural resting state.
How does a falling weight demonstrate the conversion of potential energy into kinetic energy?
As a weight falls from a height, its stored potential energy is progressively converted into kinetic energy due to its downward motion.
In what way can sound energy be used to control household appliances?
Sound energy can be used in remote sound-controlled systems to switch devices like lights, radios, fans, or televisions on or off.
How is muscular energy related to chemical energy?
The chemical energy in the food we eat is released during chemical changes in our body and is stored in our muscles as muscular energy.
How is nuclear energy used to generate electricity?
Nuclear energy is used to produce heat energy, which produces steam to turn the blades of turbines that generate electricity.
Give an example of the conversion of electrical energy into magnetic energy.
The operation of electromagnets is a practical example of converting electrical energy into magnetic energy.
What energy transformation takes place when plants undergo photosynthesis?
During photosynthesis, plants convert light energy from the sun into chemical energy.
State the law of conservation of energy.
The law of conservation of energy states that energy can neither be created nor be destroyed, but can only be transformed from one form to another.
Describe the energy states of a simple pendulum’s bob at its highest leftmost or rightmost position.
At its highest leftmost or rightmost position, the pendulum bob has maximum potential energy and zero kinetic energy.
Who established that heat is a form of energy, leading to the SI unit of work being named after him?
English physicist James Prescott Joule established that heat is a form of energy.
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