1. Pick up a handout from the front and complete it for bellringers
September 26, 2011
Pick up a handout from the front and complete it for bellringers

2. Today Go over HW Notes: Forces and D-T graphs Work time
Hand in Part 6 (Separate sheet!)
Go over part 7
Notes: Forces and D-T graphs
Work time
Newton’s 1st Law Lab (Lab pkt due tomorrow!)
Finish HW Pkt: only graphs have to be on separate sheet

3. Balanced Forces
Forces that are opposite in direction and equal in magnitude (size) are balanced forces

4. Balanced Forces
A balanced force on a resting object means… the object remains at rest.
Static Equilibrium
A balanced force on a moving object means… the object continues moving with the same speed AND direction (constant velocity)
Dynamic Equilibrium

5. Unbalanced Forces Unbalanced forces are not opposite and/or equal.
In unbalanced forces, one force is usually greater than the other.

6. Unbalanced Forces
Unbalanced forces cause a change in direction and/or speed of an object.

7. Do these arrows represent balanced or unbalanced forces?
car
Engine force
friction

8. Now… Work time Newton’s 1st Law Lab (Lab pkt due tomorrow!)
Finish HW Pkt: only graphs have to be on separate sheet
Start Review (from up front)