2. Copy in Page 39 in Spiral Speed Distance Average speed Constant speed
Word bank:
Speed
Distance
Average speed
Constant speed
Velocity
Constant velocity
Acceleration
Momentum

3. #13 Speed and Momentum

4. Speed Depends on Distance and Time
speed – the rate at which an object moves
speed depends on the distance traveled and the time it takes to get there.
Average speed = total distance
total time

5. The speed of a bicycle is the distance it travels divided by the time it takes.5

6. V = D T
D = V • T
T = D V D V T

7. V = speed in the following equations

8. Constant Speed
Speed that does not change

9. Velocity Speed with direction
A vector quantity [magnitude & direction]

10. (Its speed and direction remain the same.)
A plane with a constant velocity of 600 km/h west moves in a straight line.
(Its speed and direction
remain the same.)
A car going around a bend
at a constant 30 mph
has a constant speed,
but its velocity is not constant.
(Note the change in direction.) 10

11. stop
stop

13. Warm Up 9/2-3
What is the velocity of MMA fighter Bas Rutten if his punch is thrown forward at
.12 seconds traveling 1.5 meters

14. Varying Speed
Speed that changes during movement of an object

15. Acceleration A change in velocity Speeding up Slowing down
Positive acceleration
Slowing down
Negative acceleration
Deceleration

16. Acceleration = any change in speed OR direction!
Example of Acceleration: How velocity changed:
A plane taking off Increase in speed
Car stopping at a light Decrease in speed (deceleration)
Walking around Change in direction
a corner
A Ferris wheel Change In direction

17. Momentum What is momentum?
The San Diego Chargers have momentum entering the final weeks of the season…
Anything that is moving
has momentum
Depends on what?

18. Momentum The momentum of an object: -Depends on the object’s mass.
Mass is the amount of matter in an object
and
- Depends on the object’s velocity.
Velocity is speed in a given direction

19. p v m Calculating Momentum Momentum = mass x velocity In symbols:
p = mv
Common units of momentum: kg•m/s p m v

20. Determine the momentum of a ...
A) 60-kg person moving eastward at 9 m/s.
p = m • v
p = 60 kg x 9 m/s = 540 kg·m/s east
B) 1000-kg car moving northward at 20 m/s.
p = 1000 kg x 20 m/s = 20,000 kg·m/s
C) 40-kg dog moving southward at 2 m/s.
p = 40 kg x 2 m/s = 80 kg·m/s
Which has the most momentum?