(a) A sled sliding down a hill has more kinetic than a sled resting at the top of the hill
(b) water falling over the dam has more kinetic than water above a dam
Explanation:
Kinetic energy is a type of energy that is related to the movement of bodies. The result of kinetic energy is intrinsically linked to the mass value of the object and its velocity of movement.
In short, kinetic energy is generated through movement. For this reason, we can prove that a sled down a hill has more kinetics than a sled resting on the top of the hill just as the water falling on the dam has more kinetics than the water above the dam.
Kinetic energy is defined as the energy obtained by an object due to its motion. Whereas energy obtained by an object due to its position is known as potential energy.
(a) When a sled is resting at the top of a hill then it means the sled in not moving. Hence, then it has only potential energy. But when a sled sliding down the hill then it is moving from its initial position.
Hence, when a sled is sliding down the hill then it has higher kinetic energy.
(b) When water is above the dam then it only has potential energy but when the water falls over the dam then it has higher kinetic energy.
Burning of paper is not a physical change.It is chemical change as ash is formed in the process which is new compound and oxides of carbon are also released during the process!
