• The strength of gravity on different planets after an object's weight on that planet
• Weight is defined as:

The force acting on an object due to gravitational attraction

• Planets have strong gravitational fields
  • Hence, they attract nearby masses with a strong gravitational force

   

• Because of weight:
  • Objects stay firmly on the ground
  • Objects will always fall to the ground
  • Satellites are kept in orbit

   

Objects are attracted towards the centre of the Earth due to its gravitational field strength

• Both the weight of any body and the value of the gravitational field strength?g?differs between the surface of the Earth and the surface of other bodies in space, including the Moon because of the planet or moon's?mass
  • The greater the mass of the planet then the greater its gravitational field strength
  • A higher gravitational field strength means a larger attractive force towards the centre of that planet or moon

   

• g?varies with the distance from a planet, but on the surface of the planet, it is roughly the?same
• However, the value of?g?varies dramatically for different planets and moons

• The gravitational field strength (g) on the?Earth?is approximately 10 N/kg
• The gravitational field strength on the surface of the?Moon?is?less?than on the Earth
  • This means it would be?easier?to lift a mass on the surface of the Moon than on the Earth

   

• The gravitational field strength on the surface of the gas giants (eg. Jupiter and Saturn) is?more?than on the Earth
  • This means it would be?harder?to lift a mass on the gas giants than on the Earth

   

Value for g on the different objects in the Solar System

• On such planets such as Jupiter, an object’s mass remains the same at all points in space
• However, their weight will be a lot greater meaning for example, a human will be unable to fully stand up

A person’s weight on Jupiter would be so large a human would be unable to fully stand up