1. EVERYTHING IS MOVING!!!
Halloween Edition

2. Linear Motion
Motion is Relative – there is no place in the universe that isn’t moving, so we must state motion “relative” to something else.

3. Linear Motion
Reference Frame – the spot designated “not moving”… all motion is described relative to it (usually the ground).
Sometimes we will assign other places as reference frames. This changes the relative motion of ALL other objects.

4. Speed
A measure of distance covered in a time period, or how fast it is moving.
S= d/t
Ex. A car moves 60km in 3 hrs, it has a speed of
20km/hr
distance

5. S= d/t Speed Which has a > speed? Why? Same distance < time

6. Speed: Types
Instantaneous Speed – how fast an object is moving at an “instant” of time.
Ex: Speedometer
Average Speed = total distance/ total time

7. South
Speed vs. velocity
V , velocity is a measure of distance covered in a time period, or how fast it is moving with a direction.
V = d/t
Ex. A witch that moves 60km North in 12 hrs
has a velocity of:
West
East
5km/hr North
North

8. Constant vs Changing Velocity

9. How many accelerators in the car???
Acceleration
Δ (delta)
means “change”
How many accelerators in the car???
Δ Velocity
Δ time
Objects accelerate anytime their speed or direction changes.

10. Acceleration due to gravity (g) on Earth is about 10 m/s/s
REGARDLESS OF WEIGHT!!!
What falls faster, a bowling ball or pebble?

11. Free Fall How Fast? How Far?
Bluh, Bluh, Bluh, I Vant To Suck Your Bluuuud!
Time (s)
Speed (m/s)
Distance (m) 1 10 5 2 20 3 30 45 4 40 80 50
125
Equation t
10t
½ 10t2

12. Velocity d v t
v = d/t
d = vt
t = d/v

13. Acceleration Δv a Δt
a = Δv/Δt
Δv = aΔt
Δt= Δv/a

14. Distance (free fall) d t2
½ a
d = ½ at2
a = 2d/t2
t= √(d/½ a)

15. Equations (pg 1) V =d/t d=Vt t=d/V a =ΔV/Δt ΔV =a Δt t= ΔV/a d=1/2at2
When velocity is constant:
V =d/t d=Vt t=d/V
When the object is accelerating:
a =ΔV/Δt ΔV =a Δt t= ΔV/a
d=1/2at2
Remember, gravity is an acceleration and can be substituted for a in any of the equations when gravity is doing the accelerating.

16. Constant Velocity Graphed
Distance Time Graphs
Constant Velocity Graphed

17. Distance Time Graphs #2
Acceleration Graphed

18. Ideal Models and Air Resistance
Many examples will apply only in the “Ideal World” where air resistance/ friction doesn’t exist.

19. -10 m/s2
Speed & acceleration =
Zero!
+10 m/s2

20. 4 s
0m/s
-10m/s/s
3 s
10m/s
-10m/s/s
2 s
20m/s
-10m/s/s
1 s
30m/s
-10m/s/s
0 s
40m/s

21. Baseball ends up in his hand!
0m/s
+10m/s/s
5 s
-10m/s
+10m/s/s
6 s
-20m/s
+10m/s/s
7 s
-30m/s
Baseball ends up in his hand!
+10m/s/s
8 s
-40m/s

32. 60 30 90
120