1. Motion and Momentum

2. What is motion? All matter is constantly in motion
Motion involves a change in position.
Requires a point of reference
Distance  total length an object moves
Displacement includes distance and direction
Speed - Change in position over time
AVERAGE SPEED  total distance traveled divided by total time

3. Instantaneous speed  Object’s speed at a given instant Constant speed  When speed doesn't vary You can graph your results in a distance vs. time graph: Time = x axis Distance = y axis The steeper the line, the greater the speed Velocity— describes speed AND direction Velocity Δ if either, or both, of these Δ
Acceleration
Acceleration— Rate of change of velocity
Speeding up
Slowing down
Δ direction
Acceleration

4. Acceleration

5. Acceleration is (+) when an object speeds up and (-) when an object slows down
Acceleration can be graphed with speed on the y-axis and time on the x-axis.
An object that is speeding up line that slopes upward.
An object that is slowing down  line that slopes downward.
A horizontal line would indicate acceleration of zero, or constant speed.

6. Momentum
The amount of matter in an object  mass; inertia tendency of an object to resist a Δ in motion.
Momentum—how hard it is to stop an object
MOMENTUM

7. Momentum ↑ if the mass or velocity of the object ↑ Momentum has direction that is the same as its velocity Law of conservation of momentum—the total momentum of objects that collide w/ each other does not Δ Ex: Objects stick together & move still stuck together, although possibly at different speeds Two objects bounce off each other when they collide, & transfer momentum from one to the other In both cases, the total momentum of the objects that collide is the same before and after the collision