A boy is riding a bicycle with Its dynamo on when he Increases the speed the brightness of the bulb connected to the dynamo increases.State the law used to explain the above phenomenon.

When a horse suddenly starts moving, the rider falls backward. Name and state the law used to explain the above situation.

When a mass is suspended on a metallic wire, the length of the wire increases slightly. Name and state the law that relates to the restoring force developed in the wire and its deformation.

The earth revolves around the sun in an elliptical orbit. The closest approach of the earth with the sun is called perihelion. When the earth approaches the perihelion, its speed increases. Explain this principle.

When the sides of asquare are increased by 8cm each,its area becomes 1225sq. cm Frame an equation using the above data by taking the side of the smaller square as x cm. Find the sides of both the squares.