Gravitational force: the downward pull from the earth acting on an object.
The features of gravitational force are:
All masses attract each other
The greater the masses the stronger the force
The closer the masses the stronger the force
Gravitational field: the field in which the force of gravity acts on objects.
Near the earths surface the gravitational force is 10N on each kilogram of mass = the earths gravitational field strength is 10N per kilogram (N/kg)
Weight = mass x g (w=mg) Forces in balance
A force is a push or pull exerted by one object or another. It has a direction and a size so it’s a vector. The unit of force is the Newton (N).
Common forces
In air
Thrust
Air resistance
lift
On ground
Tension (if object is being pulled by a sting or rope). Friction Normal force (the force from another object that stops another from reaching the centre).
Water
Up thrust, Weight
PHYSICS™ -Roshan Rao
Terminal velocity; when something has reached its maximum speed.
Everything has a force on everything.
Force = mass x acceleration.
Mass is the same every where.
But weight changes because it’s the force of gravity pulling you down.
If the gravity is weak the lighter you are.
if the gravity is strong the heavier you are.