1. Motion and Forces
Section 2-3

2. What is a force? a door a rubber band Shove a book across the table
Some are obvious (car hits tree), others are not (floor pushing on feet).

3. Effects of Forces on Objects
Does the object move when a force is exerted on it?
Balanced forces:
Unbalanced Forces:

4. Inertia and Mass Inertia:
Compare the inertia of bowling ball with tennis ball
More mass =

5. Newton’s first law
An object remains in motion unless a net force acts on it. An object at rest unless a net force acts on it. (INERTIA)
Wheelbarrow with rake on top strikes a rock. What happens?
Why do cars have seatbelts?

6. Friction Force that that are touching.
Amount of friction depends on: The
, and the force pressing the surfaces together.