Gravity is one of many types of forces. It is what keeps objects to the ground, so they dont float up to space.
Gravity also holds earth and the other planets in there orbits around the sun.
The force of gravity also exists on the Moon but it is not as strong as it is on Earth. This is because the Moon is much smaller than our planet.

Gravity only becomes noticeable when there is a really massive object like a moon, planet or star. We are pulled down towards the ground because of gravity. The gravitational force pulls in the direction towards the centre of the Earth.

Gravitational force increases when:
  • The masses are bigger
  • The objects are closer

Every time you jump, you experience gravity. It pulls you back down to the ground. Without gravity, you'd float off into the atmosphere -- along with all of the other matter on Earth.
Gravitation is most familiar as the agent that gives wieght to objects with mass and causes them to fall to the ground when dropped.

click on the link below and scroll down to the gravity, streching & compression test.

Shows how gravity keeps us on the Earth
Shows how gravity keeps us on the Earth
If a person with a mass of 55kgs were to travel to Jupiter or Pluto, the effects of gravity would be very different from those on Earth. Gravity is the pull a planet exerts towards its centre. Gravity depends on mass. Jupiter has more mass than Earth so its gravity is two and a half times greater. Pluto is much smaller even than the Moon and so the force of gravity on Pluto is weaker than it is on Earth.

Take this quiz to see how good you are at gravity!

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