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Unit 1: Mechanics Page 14
5. The closer something gets to the overall net force is acting on
the object causing the force, the it.
stronger the force gets on that 8. The net force is the sum of all
object. This is the inverse- the forces on an object.
square law.
6. The four basic force fields are
gravity, magnetic, electric, and
electromagnetic.
7. An object will be pushed or
pulled in the direction in which
Lesson 2: Gravity
Whenever I teach a class about Here are the highlights for
gravity, I’ll drop something this lesson:
(usually something large). After
the heads whip around, I ask the 1. Gravity is a force that attracts
hard question: “Why did it fall?” things to one another.
2. All bodies (objects) have a
You already know the answer – gravitational field.
gravity.
3. The larger a body is, the greater
But why? Why does gravity pull the strength of the gravitational
things down, not up? And when did field.
people first start noticing that we 4. Bodies must be very, very large
stick to the surface of the planet before they exert any noticeable
and not float up into the sky? gravitational field.
No one can tell you why gravity is… 5. Gravity accelerates all things
that’s just the way the universe is equally. Which means all things
wired. Gravitation is a natural thing speed up the same amount as
that happens when you have they fall.
mass. Galileo was actually one of 6. Gravity does not care what size
the first people to do science things are or whether things are
experiment on gravity. moving. All things are
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