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Non-contact forces
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- Physical Sciences
- Institution
- 9
Aesthetically pleasing notes for physical science grade 9
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MOST COMMON FIELDS➔ GRAVITATIONAL FORCE
➔ MAGNETIC FORCE
➔ ELECTROSTATIC FORCE
GRAVITATIONAL FORCE
➔ Gravitational force is the force used to prevent us from falling off the planet and is what causes
things to fall towards the Earth.
➔ Gravitational forces exist between any two objects with mass and they are forces of attraction
(pull)
➔ The gravitational force is also the force that attracts objects with mass towards each other.
➔ Any object with mass exerts a gravitational force on any other object with mass
THE GRAVITATIONAL FIELD ON EARTH
MASS WEIGHT
❖ A body of matter that has no definite shape ❖ The attractive force in which the Earth exerts on a body
or size with mass
❖ Mass is measured in kilograms (kg) ❖ Weight is measured in Newtons (N)
❖ m= w÷g(9,8) ❖ w=m×g(9,8)
➔ weight= mass x acceleration due to gravity
❖ Weight always acts downwards
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