- Gravitational Force - A constant force regardless wherever you are on Earth. It must be with referenced to the centre of the Earth.
- Use the term "Gravitational Force" instead of gravity. Both are the same meaning.
- Gravitational Force exists not only to the centre of the Earth but also between two objects. (Even though this force is almost negligible, it still exists)
- Gravitational Potential Energy - An energy that exists only if you are at a certain height.
Misconception: There is no force acting on stationary objects.
On a straight platform
- There is gravitational force acting on the object, therefore, it doesn't move.
On a ramp with object not moving
- There is gravitational force and frictional force acting on it. This prevents the object from rolling forward or backwards.
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