# Speed_ Velocity_ Acceleration

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```					Review
Lesson 1: refer to page 56
1. What are things you should know to describe an object’s position? (Hint: 3 things) What is the hurdler’s starting position from the starting line? If you subtract her final position from her initial position, what is the hurdler’s total change in position? What pattern is taking place after each second in the hurdler’s run? Speed is how much the hurdler’s position changes over time. What is the hurdler’s speed (in meters per second- m/s)? Does her speed change per second? Yes/no and why?

2. 3. 4.
5.

6.

Speed, Velocity, Acceleration
Describe how an object’s position and motion change in time.
Speed: rate of change of distance with time What are some measurements of speed? Constant Speed? Changing Speed? Instantaneous Speed?

BrainPop!

Getting the AVERAGE Speed
Average Speed: total distance travelled divided by the total time V= d/t

Try this: Batman drove 40 miles in 25 mins. What was his average speed?

Finding distance/time/average speed
V=D T D=?
T=?

V=D T D = VT

D = VT

D = VT V V

Velocity & Vector
** REVIEW Position as a Vector = Direction + Distance

Scenario

- Give your location in terms of direction, distance (and reference point if applicable)

Velocity as a Vector

= Direction + Speed

Velocity is a vector because it involves 2 measurements: the speed & direction of motion. Does velocity mean speed?

Acceleration (Last one)
- Change in velocity over time
Position as a Vector = Direction + Distance Velocity as a Vector = Direction + Speed

Acceleration as a Vector = size + direction

Size

Acceleration

Direction

Acceleration

Acceleration

Size

Acceleration

Direction

- An object moving at a constant speed, but changing direction. Why is this considered acceleration?

Vocabulary
Speed- rate of change of distance with time Constant Speed- travels the same distance each second Instantaneous Speed- speed at a specific instant in time Average Speed- total distance traveled divided by total time Velocity- speed and direction of motion Acceleration- rate at which velocity changes with time

How things fall into place
Motion

position vector

speed velocity

acceleration

Homework: Lesson 2 review (White box only)

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