Mass, Weight and Gravity

Gravity

Gravity is the frce of attraction between all masses, but you only really notice it when the mass is really big, e.g. a planet.

It has some important effects:

• On the surface of a planet, it makes things accelerate towards the ground
• It gives everything a weight
• It keeps planets, moons and satellites in their orbits (the orbit is a balance between the forward motion of the object and…