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- In physics, the concept of energy plays the role of the money. Work is transferred to or from an object by means of force acting on the body. Energy transferred to the body is positive work and the energy transferred from the body is negative work.
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- The time rate at which work is done by a force is called the power and it is measured in Watts.
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- Work - energy theorem states that the work done by a force in displacing a body, gives the measure of change in kinetic energy of the body.
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- There are two types of energy - potential and kinetic.
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- Potential energy is the energy than can be associated with the configuration.
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- There are two types of forces - Conservative and non conservative.
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- Gravitational force is a conservative force and frictional force is non-conservative.
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- Law of conservation of energy states that the total energy of an isolated system cannot change.
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- A collision is said to take place when either two bodies physically collide against each other or when the path of one body is changed by the influence of the other body.
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- A collision is said to be an elastic collision if both the kinetic energy and momentum are conserved in the collision.
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- A collision is said to be an inelastic collision if the kinetic energy is not conserved in the collision. However, the momentum is conserved.
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- If the two bodies stick together after the collision, the collision is said to be perfectly inelastic.
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- It is that elastic collision in which the colliding bodies move along the same straight line, before and after the collision.
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- Types of energy are heat energy, electrical energy, chemical energy and nuclear energy.
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