Gravity in space

• Gravity


  The tiny force that pulls objects together when they are near each other
• Gravity


  • The bigger the mass of the object, the stronger the force of gravity
  • Gravity is a force and it is what keeps us on the Earth's surface
  • The mass of the Earth is much larger than the mass of the humans on Earth
• Weight


  The force of gravity pulling you to the Earth, measured in Newtons
• Mass


  The amount of matter that something contains, measured in kilograms (kg)
• Gravitational field strength


  • The space around the Earth where its gravity attracts things
  • Approximately 10 Newtons per kilogram (10 N/kg) at the Earth's surface
• Calculating weight


  Weight (N) = mass (kg) x gravitational field strength (N/kg)
• The force of gravity between the Sun and the Earth


  Keeps the Earth in its orbit
• The Earth travels around the Sun at 100,000 km/h and if it did not have gravity from the Sun it would fly away into the Solar System
• The force of gravity


  Gets weaker as objects move further apart
• Satellite


  Any object that orbits a planet
• Satellites


  • The Moon (natural)
  • Artificial satellites used for photographing the Earth or transmitting television programs
• Calculating weight on Earth

  Weight (N) = mass (kg) x gravitational field strength (10 N/kg)
• Calculating weight on the Moon

  Weight (N) = mass (kg) x gravitational field strength (1.6 N/kg)
• The planet Jupiter


  Experiences less gravitational force than Mercury
• How the Moon stays in orbit around the Earth

  Due to the force of gravity between the Earth and the Moon