Gravitation
Newton’s Law of Universal Gravitation
The force of gravity between two objects depends
on the square of the
Effect of Mass and Distance on Gravity
on the
between the objects.
of each object and
Another Way of Thinking about g…

Setting

Cancelling the
equal to the force of
gives:
gives a more accurate definition of g:
Gravitational Potential Energy

We know that

When moving an object from a
near the Earth’s surface but what about farther away?
potential to an
is equal to the change in
potential,
:
𝑊 = 𝐹𝑑
𝑊=
𝐺𝑚1 𝑚2
×d
𝑑2
𝑊 = ∆𝐸 = 𝑼 =
𝑮𝒎𝟏 𝒎𝟐
𝒅
Reminder

Mass: depends on how an object responds to a

Mass: depends on how an object
Practice
1.
2.
field
in response to a net force