1.2.9

Gravity

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Free Fall

If an object is in free fall, then the object’s weight is the only force acting on it. The weight of an object is the force that acts downwards on an object due to gravity.

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Free fall

  • The acceleration caused by gravity is constant, as long as air resistance is ignored.
  • This constant acceleration is called free fall.
  • Air resistance can reduce the acceleration.
    • But the force of gravity itself stays the same.
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Acceleration due to gravity

  • An object in free fall will accelerate at a constant rate.
  • This constant rate is called the acceleration due to gravity (g).
  • The average value for acceleration on Earth due to gravity is 9.8 m/s2.

Jump to other topics

1Motion, Forces & Energy

1.1Physical Quantities & Measurement Techniques

1.2Motion

1.3Mass & Weight

1.4Density

1.5Forces: Effects of Forces

1.6Forces: Turning Effects of Forces

1.7Forces: Centre of Gravity

1.8Momentum

1.9Energy, Work, & Power: Energy

1.10Energy, Work & Power: Work

1.11Energy, Work & Power: Energy Resources

1.12Energy, Work & Power: Power

1.13Pressure

2Thermal Physics

3Waves

4Electricity & Magnetism

4.1Simple Phenomena of Magnetism

4.2Electrical Quantities: Electric Charge

4.3Electrical Quantities: Electric Current

4.4Electromotive Force & Potential Difference

4.5Electrical Quantities: Resistance

4.6Electrical Energy & Electrical Power

4.7Electric Circuits: Circuit Diagrams & Components

4.8Electric Circuits: Series & Parallel Circuits

4.9Electric Circuits: Action & Use

4.10Electrical Safety

4.11Electromagnetic Effects: Electromagnetic Induction

4.12Electromagnetic Effects: The A.C. Generator

4.13Magnetic Effect of a Current

4.14Force on a Current-Carrying Conductor

4.15Electromagnetic Effects: The D.C. Motor

4.16Electromagnetic Effects: The Transformer

5Nuclear Physics

6Space Physics

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