1. Mr. Lambert Integrated Science 1A Trimester 2, 2014
Day 5 – Quiz day
Mr. Lambert
Integrated Science 1A
Trimester 2, 2014

2. Bell Ringer
Come up with a scenario for the following distance-time graph:

3. Agenda
Quick review
QUIZ
Exit Slip

4. Learning Targets
On your Bell Ringer Sheet, write the following: We will define frames of reference and relate them to speed

6. In physics, a “point of view” is called Frame of Reference (FOR)
Reference frame
Speed is relative!
This means that how fast/slow an object moves depends on the watcher’s “point of view”
In physics, a “point of view” is called Frame of Reference (FOR)

7. Frames of reference
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8. A boy rides his skateboard down the sidewalk at 3m/s north.
Practice Problem #1
A boy rides his skateboard down the sidewalk at 3m/s north.
How fast is the boy moving relative to someone standing on the sidewalk?
What is the boy’s speed relative to the skateboard?

9. Practice Problem #2
Sabrina is riding her bicycle at 5 mph while holding a tennis ball. A boy is running in the opposite direction at 5 mph.
Sabrina drops the ball. What is the speed of the ball relative to the boy standing on the sidewalk?
What is the speed of Sabrina relative to the boy?

10. Practice Problem #3
Train pulls into station at 40m/s. As the train moves, a passenger walks at 2m/s towards the front of the train.
What is the speed of the walking passenger relative to the passengers on the train?
What is the speed of the walking passenger relative to the people waiting on the platform?

11. Videos! Mythbusters relative motion Relative motion projectile
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Relative motion projectile
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12. Practice Problem #3
Sam is standing in the back of a pick-up truck traveling at 35m/s. He throws apples backwards off the truck as it moves. Everyone knows Sam can throw apples at a speed of 12m/s every time.
What is the speed of the apple before it is thrown relative to Sam?
What is the speed of the apple as it is thrown relative to Sam?
What is the speed of the apple as it is thrown relative to Sam’s friend across the street?

13. Practice Problem #4
You are pulling your little brother in his red wagon. He has a ball, and he throws it straight up into the air while you are pulling him forward at a constant speed.
What will the path of the ball look like to your little brother? SKETCH IT!
A little girl is standing on the sidewalk watching. What will the path of the ball look like to her? SKETCH IT! 
If your brother throws the ball forward at a velocity of 2.0m/s while you are pulling the wagon at a velocity of 4.0m/s, at what speed does the girl see the ball move?

14. Groups Complete handout
ent.aspx?doctype=5&filename=K inematics_RelativeVelocity.xml

15. Exit Slip
A quarterback throws a football down the field at 50 mph. His receiver is running down the field at 20 mph.
How fast is the football moving from your point of view (as you are sitting in the bleachers)
How fast is the football moving from the point of view of the receiver?
Do you think they are the same?