Name: _________________________________________
Date: _________________________
Aim #8: How do we describe and calculate motion?
Do Now: Name 3 things you see move everyday. How would you describe how each one moves?
A. MOTION:
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To measure the position of an object a ________________________________ must be chosen
B. REFERENCE POINT: Object that is ___________________________ and is used as a ________________________
to determine if another object is in motion
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If there is a change in distance between the reference point and the object, then the
object is in motion
Explain in the space below how you
know the mail truck moved
What is the reference point that you chose?
A. MEASURING DISTANCE
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DISTANCE: _____________________________________________________________________________
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SI base for distance (length): ___________________________________________________________
EX: A runner jogs to the 50m mark of a track and then runs back to the 20m mark. How far did the
runner travel? Show your work
EX: You leave your house and walk 52 m to a friend’s house. You get to her house and realize you
left your phone at home and walk back to your house. You leave your house again and walk back
to your friend’s house. What was the total distance traveled? Show your work
To describe how fast something is moving, you need to know how far (distance) it travels in a given
amount of time. The speed of an object usually changes as it moves from one place to the next.
B. SPEED:
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SI unit for DISTANCE (D):
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SI unit for TIME (T):
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SI unit for SPEED (S):
C. CALCULATING AVERAGE SPEED: how quickly an object moved over the entire distance traveled.
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FORMULA:
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FORMULA IN WORDS: speed is equal to the
DISTANCE (D) =
SPEED (S) =
TIME (T) =
EX: What is the average speed of a car that travels a distance of 625 m in 25 s? Show all work
THOUGHT QUESTION:
Do all objects move at a constant speed? Is every speed you experience constant? Answer Below!