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Ch. 10 Motion

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**1. **Ch. 10 Motion I. Describing Motion
Motion
Speed & Velocity
Acceleration

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

**3. **A. Motion Motion
Change in position in relation to a reference point.

**4. **A. Motion Problem:
You are a passenger in a car stopped at a stop sign. Out of the corner of your eye, you notice a tree on the side of the road begin to move forward.
You have mistakenly set yourself as the reference point.

**5. **B. Speed & Velocity Speed
rate of motion
distance traveled per unit time

**6. **B. Speed & Velocity Instantaneous Speed
speed at a given instant
Average Speed

**7. **B. Speed & Velocity Problem:
A storm is 10 km away and is moving at a speed of 60 km/h. Should you be worried?

**8. **B. Speed & Velocity Velocity
speed in a given direction
can change even when the speed is constant!

**9. **C. Acceleration Acceleration
the rate of change of velocity
change in speed or direction

**10. **C. Acceleration Positive acceleration
“speeding up”

**11. **D. Calculations

**12. **D. Calculations

**13. **D. Calculations

**14. **D. Calculations

**15. **E. Graphing Motion slope =
steeper slope =
straight line =
flat line =

**16. **E. Graphing Motion Who started out faster?
A (steeper slope)
Who had a constant speed?
A
Describe B from 10-20 min.
B stopped moving
Find their average speeds.
A = (2400m) ÷ (30min) A = 80 m/min
B = (1200m) ÷ (30min) B = 40 m/min

**17. **E. Graphing Motion Acceleration is indicated by a curve on a Distance-Time graph.
Changing slope = changing velocity

**18. **E. Graphing Motion slope =
straight line =
flat line =

**19. **E. Graphing Motion Specify the time period when the object was...
slowing down
5 to 10 seconds
speeding up
0 to 3 seconds
moving at a constant speed
3 to 5 seconds
not moving
0 & 10 seconds