The Force is With You? You may have heard that gravity isn't a force. This is true. Gravity is not a force; however, this truth leaves us with a number of questions. For example, we're commonly ...

Weight and mass are very different. Find out more with BBC Bitesize. For students between the ages of 11 and 14.

Because we know the radius of the Earth, we can use the Law of Universal Gravitation to calculate the mass of the Earth in terms of the gravitational force on an object (its weight) at the Earth's ...

Weight and mass are very different. Find out more with BBC Bitesize. For students between the ages of 11 and 14.