Key Stage 2
Meaning
Gravity is a force that causes all objects to be attracted to each other.
About Gravity
- Gravity is a non-contact force.
- Gravity affects all objects.
- Gravity pulls us down towards the centre of the Earth.
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If person A drops the cog it will fall towards the centre of the Earth. If person B drops the spanner it will fall towards the centre of the Earth.
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- Gravity is what keeps the Earth orbiting The Sun.
Key Stage 3
Meaning
Gravity is a force that causes all objects with mass to be attracted to each other.
About Gravity
- Gravity is a force so it is measured in Newtons.
- Gravity is a non-contact force because it can act without objects touching.
- All objects are affected by gravity.
- Gravity is the force that pulls objects to the ground.
- Isaac Newton was the first to realise that gravity is the force that holds the planets in orbit around The Sun.
- The force of gravity between two objects is always equal in magnitude but opposite in direction.
Falling
Energy Transfers
Accelerating
- When an object accelerates towards the ground energy is transferred from the gravitational potential energy store of the object to the kinetic energy store of the object.
Decelerating
- When an object decelerates away from the ground energy is transferred from the kinetic energy store of the object to the gravitational potential energy store of the object.
Forces
Accelerating
- When an object accelerates towards the ground gravity is causing a mechanical energy transfer.
Decelerating
- When an object decelerates away from the ground gravity is causing a mechanical energy transfer.
Orbits
- Newton was the first person to realise that objects were held in orbit by gravity which he explained in his Law of Universal Gravitation.
- Moons orbit planets and planets orbit the stars due to gravity.
- Gravity is a constant force directed to the centre of a massive object.
- The Moon feels a force pulling it towards the centre of the Earth. The Earth feels a force equal in magnitude but opposite in direction to that of The Moon.
Key Stage 4
Meaning
Gravity is a force of attraction which acts between all objects with mass.
About Gravity
The strength of gravity between two objects depends on:
- When a small mass object is in the Gravitational Field of a large mass object the force on the small mass is referred to as weight rather than gravity.
Falling
Energy Transfers
Accelerating
- When an object accelerates towards the ground energy is transferred from the gravitational potential energy store of the object to the kinetic energy store of the object.
Decelerating
- When an object decelerates away from the ground energy is transferred from the kinetic energy store of the object to the gravitational potential energy store of the object.
Forces
Accelerating
- When an object accelerates towards the ground gravity is causing a mechanical energy transfer.
Decelerating
- When an object decelerates away from the ground gravity is causing a mechanical energy transfer.
Orbits
- Newton was the first person to realise that objects were held in orbit by gravity which he explained in his Law of Universal Gravitation.
- Moons orbit planets and planets orbit the stars due to gravity.
- Gravity is a constant force directed to the centre of a massive object.
- The Moon feels a force pulling it towards the centre of the Earth. The Earth feels a force equal in magnitude but opposite in direction to that of The Moon.
Key Stage 5
Meaning
The gravitational interaction is the mechanism by which all particles with mass affect one another.
About The Gravitational Interaction at Subatomic Scales
- The gravitational interaction is one of the 4 fundamental interactions governing how particles affect one another.
- The gravitational interaction causes all particles with mass to be attracted to one another.
- The gravitational interaction is extremely weak on the scale of atomic masses but is 'long range' and cannot be shielded, so accumulates with large numbers of atoms to be observable at macroscopic scales.
- The gravitational interaction may be mediated by an, as yet, undiscovered fundamental particle called a graviton.
About The Gravitational Interaction at Macroscopic Scales
- Due to its long range and the inability to shield the gravitational interaction it is responsible for the large scale structure of the observable universe.
References
AQA
- Gravity, pages 119, 249-50, GCSE Physics, Hodder, AQA
- Gravity, pages 140, 274-5, 278-82, 290-1, GCSE Physics; Student Book, Collins, AQA
- Gravity, pages 209, GCSE Combined Science Trilogy 2, Hodder, AQA
- Gravity, pages 4-5, 10-11, 146-147, GCSE Physics; Third Edition, Oxford University Press, AQA
Edexcel
- Gravity, page 291, GCSE Combined Science, Pearson Edexcel
- Gravity, page 37, GCSE Physics, CGP, Edexcel
- Gravity, pages 7, 120, GCSE Physics, Pearson Edexcel
- Gravity; acceleration due to, page 26, GCSE Physics, CGP, Edexcel
- Gravity; forces, pages 37, 38, 184, 185, GCSE Physics, CGP, Edexcel