1. Chapter 2 Motion 2-1. Speed 2-2. Vectors 2-3. Acceleration
2-4. Distance, Time, and Acceleration Free Fall System 2-6. Air Resistance 2-7. First Law of Motion
2-8. Mass
2-9. Second Law of Motion
2-10. Mass and Weight
2-11. Third Law of Motion
2-12. Circular Motion
2-13. Newton's Law of Gravity
2-14. Artificial Satellites

2. 2-1. Speed Definitions: v = d/t Speed General formula for speed:
The rate at which something moves a given distance.
Faster speeds = greater distances
General formula for speed:
Speed = distance / time
Abbreviations commonly used:
d = distance t = time v = speed
v = d/t

3. 2-1. Speed
Velocity
Distance
Time

4. 2-1. Speed
Average speed is the total distance traveled by an object divided by the time taken to travel that distance. 
Instantaneous speed is an object's speed at a given instant of time.

5. 2-2. Vectors
Velocity is a vector quantity that includes both speed and direction.

6. 2-3. Acceleration
Acceleration of an object is the rate of change of its velocity and is a vector quantity. For straight-line motion, average acceleration is the rate of change of speed:

7. 2-3. Acceleration 3 Types of Acceleartion Speeding Up Slowing Down
Turning

8. 2- 4. Distance, Time and Acceleration
(V1 + V2) Vavg =
(20mph + 60mph) = 40mph
d = vavg t
d = ½at2
30mph 2hr = 60miles
½ 10m/s/s 52 = 125m

9. 2-5. Free Fall
The acceleration of gravity (g) for objects in free fall at the earth's surface is 9.8 m/s2.
Galileo found that all things fall at the same rate.

10. 2-5. Free Fall The rate of falling increases by 9.8 m/s every second.
Height = ½ gt2
For example:
½ (9.8 )12 = 4.9 m ½(9.8)22 = 19.6 m
½ (9.8)32 = 44.1 m
½ (9.8)42 = 78.4 m

11. 2-5. Free Fall
A ball thrown horizontally will fall at the same rate as a ball dropped directly.

12. 2-5. Free Fall
A ball thrown into the air will slow down, stop, and then begin to fall with the acceleration due to gravity. When it passes the thrower, it will be traveling at the same rate at which it was thrown.

13. 2-5. Free Fall
An object thrown upward at an angle to the ground follows a curved path called a parabola.

14. 2-6. Air Resistance In air… In a vacuum
A stone falls faster than a feather
Air resistance affects stone less
In a vacuum
A stone and a feather will fall at the same speed.

15. 2-6. Air Resistance Free Fall
A person in free fall reaches a terminal velocity of around 54 m/s
With a parachute, terminal velocity is only 6.3 m/s
Allows a safe landing

16. 2-6. Air Resistance Ideal angle for a projectile
In a vacuum, maximum distance is at an angle of 45o
With air resistance (real world), angle is less
Baseball will go furthest hit at an angle of around 40o