1. Example of push forces Example of pull forces Examples of push and pull
forces
-____________ something - ________ something from
the ground - ____________ force
- ___________ something (eg,
abutton) - ______________ force - ____________ force
- ___________ something - _____________something
(eg rubber band)

2. Do youthink a force has direction?
It does, force is a ___________ quantity, which has both
_____________ and _______________!
Newton’s first law states that “Every body
continues in a state of rest or uniform velocity in a straight line,unless an
external force acts on it.”
So a force can do what?
 Force can make a ______________ object move.
 Force can also change the ______________ of an object where it could mean
changing the amountor the direction!
(velocity refers to speed with a direction)
What We Experience How It Fits Together How We Explain It
Newton's First Law Newton's First Law Newton's First Law
- Books sitting on a bookshelf (no - The things that are - Objects at rest tend to
motion, no force) stationary need _____________, while
something to make them objects in motion will stay in
- A car sitting in a parking lot (no move. _____________________ at
motion, no force) a ________________ (unless
- The things that are a force changes that speed or
- A frisbee flying through the air moving need something direction)
(moving, but no accelerating force, until to get them to stop.
it is caught)
Magnetic force
A magnetic substance is a substance that displays magnetic properties
Every natural magnet has both a ________ pole and ___________ pole
Like poles of magnets _________ while unlike poles ___________
Magnetic materials
The elements Nickel, Cobalt and _______
_________ is an alloy of iron and has magnetic properties too!
Gravitational Force
Anything in the universe that has mass would have a ______________________ to every
other mass. The larger the mass an object has, the stronger its ability to attract other objects
become.
Earth’s gravitational force pulls objects ____________________ of the planet.

3. the equation used to calculate the pull of Earth on objects is_____________
where F is the force in newtons
m is the mass of the object in kg
and g is the _______________________________, which on earth is 10N/kg
Electrical force
Objects carrying electrical charges (positive and negative) exert an electrostatic force on other
charged objects.
Like charges will experience repulsion, while unlike charges experience electrostatic
attraction
Friction opposes the movement between one surface across another surface by working in
opposite direction from the direction of the movement.
Friction is increased when
1) surfaces are ____________
2) the _____________________________________ is large (for
example, a book’s weight affect the force felt between the book
surface and table surface)