Give one example of energy degradation.

What do you mean by degradation of energy ? Explain it by taking one example from your daily life.

Energy can neither be created nor destroyed. Then why is there so much fuss about every crisis?

A car of mass $750 \mathrm{kg}$ accelerates away from traffic lights. At the end of the first $100 \mathrm{m}$ it has reached a speed of $12 \mathrm{m} {\mathrm{s}}^{-1}$. During this time, its engine provides an average forward force of $780 \mathrm{N}$, and the average force of friction on the car is $240 \mathrm{N}$.

Explain whether your answers are consistent with the principle of conservation of energy.

A stone of mass $500 \mathrm{g}$is thrown vertically upwards with a velocity of $15 \mathrm{m} {\mathrm{s}}^{-1}$. Calculate the total energy at its halfway point.

Divya always switched off unwanted lights, fans and electric gadgets when not in use. Comparatively her electricity bill cut down to half:

$\left(c\right)$ What values does Divya show?

A simple pendulum, while oscillation, rises to a maximum vertical height $5 \mathrm{cm}$from its rest position when it reaches to one side on its extreme position. If mass of bob of simple pendulum is $500 \mathrm{g}$and $g=10 {\mathrm{ms}}^{-2}$, find the velocity of bob at its resting position. State the assumption made in your calculation.

When a spring is compressed and then released the potential energy is converted into kinetic energy.

This is due to law of conservation of _____