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# Speed Intro

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• 1. MOTION
• We now know that unbalanced forces can change motion
• Recognizing MotionTextbook pg 17-18
When is an object in motion?
Are you or your book moving
Compared to the floor?
Compared to the sun?
What is a reference point?
What do we assume about a reference point?
For the bus example, why do you think you are moving backward?
• 2. Recognizing Motion ANSWERSTextbook pg 17-18
When is an object in motion?
When it’s distance from another object is changing
Are you or your book moving?
Compared to the floor? NO
Compared to the sun? YES
• What is a reference point?
A place or object used for comparison
• What do we assume about a reference point?
It is stationary
• 3. Recognizing Motion ANSWERSTextbook pg 17-18
For the bus example, why do you think you are moving backward?
Your reference point (the other bus) wasn’t stationary
You 
Reference 
point
• 4. What’s a Frame of Reference?
• 5. BACKGROUND OR OBJECT USED FOR COMPARISON
• 6. Now we are going to look at ways to describe and measure motion
SPEED
• 7. How do we describe SPEED?
HOW FAST SOMETHING GOES
• 8. How do we CALCULATE SPEED?
How we describe the speed of a CAR:
Miles per hour (MPH)
OR
Kilometers per hour (km/h)
What does the miles or kilometers measure?
They are units for distance
What does the hour measure?
It is a unit for time
What does the “per” or “/” mean in math?
division
• 9. Measuring Motion
SPEED =RATE that an object moves
Distance (D)
Rate (speed) =
Time (T)
• 10. DISTANCE
Length between two places
Distance = rate (speed) x time
D= RT
“Dirt”
• 11. TIME
=
d
T
r (speed)
• 12. STEPS IN PROBLEM SOLVING
• STEP 1. Write the formula
• 13. STEP 2. Substitute given
numbers and units
• STEP 3. Solve for the
unknown.
• 14. SAMPLE PROBLEM:
At what speed did a plane fly if it traveled 1760 meters in 8 seconds?
• 15. SOLUTION
Step 1. Question asked “What speed” so use:
Rate (Speed) = Distance/Time
• 16. SOLUTION
Step 2. substitute distance = 1760 meters
substitute time = 8 seconds
Speed = 1760 meters/ 8 seconds
• 17. SOLUTION