Physics: Mass, Weight, Radioactive Half-Life, Fission and Fusion

Half time

the time taken for the radioactivity of a specified isotope to fall to half its original value.

Mass is the actual amount of material contained in

A body and is measured in kg, gm, etc.

The mass of an object does not change

in relation to its position.

Your mass on the moon is the same

as your mass on earth.

Weight is the measure of the amount of force acting on a

mass due to the acceleration due to gravity.

The weight of an object would change in relation to its

position and gravity.

Your weight on the moon is less than your weight on earth because of the

gravity

Fission

Splitting of a large atom into two or more particles does not occur naturally. Highly reactive products are produced Little energy needed to split

Fusion

Fusing two or more lighter atoms into a larger one in a high-density, high-temperature environment. A lot of energy is needed to combine