1. Forces
Any push or pull

2. Forces any push or pull wants to change the motion of an object
has size
has direction
can change speed
can change direction
unit is the Newton

3. Newton metric unit of weight = mass x force of gravity
= mass x 9.8 m/sec2

4. Contact vs Non-contact
Contact: there is contact between what is exerting the force and what is receiving the force
Non-contact: the result is visible but you cannot see the contact between the force and the agent, example gravity

5. Net Force combination of all of the forces
determined by the directions of the forces
shown by vectors

6. Vector arrow attached to the receiver of the force
length = magnitude of the force
direction shown by the arrow head
→, ↓, ↑, ←

7. Net force Forces in the same direction: add the forces together
Forces in different directions: subtract the smaller force from the larger one

8. Balanced Forces net force = 0 no change in motion
an object at rest will stay at rest

9. Unbalanced Force Net force ≠ 0 change in speed change in direction
object at rest will move
object moving might stop