3. Force - a push or a pull that one object exerts
on another.
For example - a magnet pulling an iron nail,
a person pushing a chair.

4. How Do You Measure Force?
We use a spring scale. In a spring scale the
spring is attached to an object and the spring is
pulled until the object moved.

5. Newton
A unit for measuring force. It is equal
to 9.8 kilogram-meter per second
square

6. How Do Forces Affect Objects?
Force can change the motion of objects.
For example, when a batter strikes the ball.
The bat has exerted a force on the ball and has it flying
toward the outfield.
Force can change the shape of an object.
For example, when you crush a soda can. The force your
hand applied can crumple the soda can into a new,
squashed shape.