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Essential Question
How Do Objects React To Forces?
What is a force?
What are the Main Types of Forces?
What Factors Affect Gravity?
What Is a Force?
When one object pushes or pulls another object, the first object exerts a force on the second.
Shown with arrows (direction & force) SI units called newton after Sir Isaac
Newton.
Extra Credit: Build a Magnet
Things You'll Need Iron nail, wire, wire cutters, Knife, Battery,
Tape, Paper clips, Adult Supervision
Gravitational ForceThe force that pulls objects toward each
other.
The law of universal gravitation states that the
force of gravity acts between all objects in the universe that have mass!
Sorry I was
attracted to you!
Two Factors Affect Gravity
1.Mass: the more mass the greater the gravitational force.
2.Distance: the greater the distance the less gravitational force.
Try it!1. Place the can on its side on a flat smooth surface like a table or a smooth floor.
2. Rub the blown up balloon back and forth through your hair really fast.
3. Now the fun part - Hold the balloon close to the can without actually touching the can. The can will start to roll towards the balloon without you even touching it!
Try This Too: While you've got the balloon out, tear up part of a tissue into tiny pieces about 1/4 inch (.5 cm) big. Rub the balloon in your hair again and bring it close to the tissue pieces. They will be attracted to the balloon and then jump away.
* An empty soda can* Blown-up balloon* A head of hair