1. Ch. 11: Motion

2. Motion Problem: We need a reference point... Is your desk moving?
nonmoving point from which motion is measured

3. Motion A change in position
Frame of reference = system of objects that are not moving with respect to one another

4. Distance versus Displacement
Distance is the length of a path between two points
SI Unit is meter (m)
Displacement is the length from the starting point to the ending point

5. Speed
the ratio of the distance (d) an object moves to the amount of time (t) the object moves
SI Unit is meter per second (m/s)
V=d/t
V = velocity!
Distance
Velocity
time

6. Speed Average speed = computed for the entire duration of the trip
Instantaneous speed = measured at a particular instant
Velocity (V) = the speed and direction an object is moving
Vector = a quantity that has magnitude and direction

7. t d v Calculations d = 100 m v = d ÷ t t = 20 s v = (100 m) ÷ (20 s)
Your neighbor skates at a speed of 4 m/s. You can skate 100 m in 20 s. Who skates faster?
GIVEN:
d = 100 m
t = 20 s
v = ?
WORK:
v = d ÷ t
v = (100 m) ÷ (20 s)
v = 5 m/s
You skate faster! v d t

8. t d v Calculations t = d ÷ v t = (1000 m) ÷ (330 m/s) t = 3.03 s
Sound travels 330 m/s. If a lightning bolt strikes the ground 1 km away from you, how long will it take for you to hear it?
GIVEN:
v = 330 m/s
d = 1km = 1000m
t = ?
WORK:
t = d ÷ v
t = (1000 m) ÷ (330 m/s)
t = 3.03 s v d t

9. Graphing speed Slope tells me SPEED!
Horizontal part tells me the object stop moving

10. Graphing speed
Curved parts tells me object is increasing and decreasing speed
Straight portions tell me constant speed
Greater the slope the higher the speed, vice versa

11. Distance-Time Graphs

12. Distance-Time Graphs
No motion=stopped

13. V=d/t
Florence Griffith Joyner set a world record by running 200m in 21.34s. What was her average speed?

14. Acceleration Is the rate at which velocity changes changes in speed
changes in direction
changes in speed and direction
SI unit is meter per second per second (m/s2)

15. Acceleration
The triangle is the Greek symbol delta, it means “change in”
Vf = final velocity
Vi = initial velocity
Vf-Vi (final minus initial)

16. Graphing acceleration

17. Graphing Acceleration
Slope of Speed-Time graph tells me acceleration!
Horizontal part tells me object is at constant speed
Slope downward tells me object is slowing down (decelerating)

18. Speed-Time Graph

19. Speed-Time Graph
Constant speed/velocity
STOPPED!

20. a=Vf-Vi/t
The speed limit changes from 55m/s to 0m/s. To make the change in 10s, what acceleration will it require?

21. a=Vf-Vi/t
A car’s acceleration is 3m/s2. if the car started at rest and it only took 10s for the car to reach this acceleration, what is the car’s final velocity?

22. IAN pg. 27: Acceleration Title: Acceleration
Define acceleration from notes.
Write acceleration equation and define all varaibles (i.e. “a” stands for acceleration)
Write all units (i.e. acceleration is measured in m/s2)
Complete the sample problems on handout and glue into notebook.

23. IAN pg. 28: Speed-Time Graphs
Title: Speed-Time Graphs
Glue in the 4 graphs we labeled together
Write the following information:
Slope = __________________
A synonym for slowing down is _____
Label on the Negative Acceleration Graph where the object is moving at CONSTANT ACCELERATION

24. Agenda: 4/17 Trade cell phone for calculator!
Be in your new seat with your PhysiFacts notebook and be ready to start when the bell rings!
Today’s Order of Operations:
2nd block: review #1 on PF from yesterday!
PhysiFacts = Acceleration Problems (plus resubmit Velocity questions)
Velocity and Acceleration Word Problems
Ch. 11 Assessment (quiz grade)

25. PhysiFacts 4.5
Delilah can run 50 meters in 10 seconds. What is her velocity?
d = 50 m, t=10 s
V = d/t ; v = 50/10 = 5m/s

26. Chapter 11 Assessment – p. 350-351
Will count as a quiz grade!
1-10 – just write the letter answer
Draw the concept map and fill it in
Make sure to turn in to the basket!

27. IAN pg. 24: Distance vs. Displacement
Define both terms – DISTANCE and DISPLACEMENT.
ON HANDOUT:
Trace the DISTANCE in purple
Trace the DISPLACEMENT in orange
Trim handout and glue/tape on page under definitions

28. PhysiFacts 4.5
Delilah can run 50 meters in 10 seconds. What is her velocity?
Zoey has a top speed of 7m/s. It takes her 20 seconds to run from the house to the field. How far away is the field?
Roxy can walk at a pace of 0.3m/s. The wind blew her favorite toy 300 meters away. How long will it take her to retrieve her toy?

29. IAN pg. 25: Speed/Velocity
Define velocity.
Write the velocity equation and circle.
Define the variables (i.e. v stands for velocity)
Write the units for each variable
(i.e. velocity is measured in m/s)
Complete the practice problems on the handout and glue the handout on the page.

30. IAN pg. 26: Distance-Time Graphs
Title: Distance-Time Graphs
Glue in the 4 graphs that we labeled together
Label the portion of Varying Speed graph that represents no motion (stopped)
Write the following information:
Slope = ______________
X – axis = ______________
Y – axis = ______________

31. IAN pg. 26: Distance-Time Graphs
Title: Distance-Time Graphs
Glue in the 4 graphs that we labeled together
Label the portion of Varying Speed graph that represents no motion (stopped)
Write the following information:
Slope = ______________
X – axis = ______________
Y – axis = ______________