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Transcript
```
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An object is in motion if the distance from
another object is changing.
A reference point is the starting point you
choose to describe the location, or position of
an object.
Position is an object’s distance and direction
from a reference point.
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Displacement is the difference between the
initial (first) position and the final position of
an object.
Distance is the length traveled.
45m
45 m
Distance = 90 m
Displacement = 0 m
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Constant Speed = speed stays the same
Instantaneous Speed = speed at a specific
instant in time.
Speed changes when: you slow down
you speed up
you stop
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Velocity is the speed AND direction of a
moving object.
Velocity changes when: speed changes
direction changes
both change
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Speed = Distance
Time
Average Speed = Total Distance
Total Time
Distance = Speed X Time
Time = Distance
Speed
1.
2.
3.
A mail truck takes 20 s to move between
mailboxes that are 10 m apart. What is the
average speed of the mail truck?
Sound travels 330 m/s. You hear the sound
of the bat hitting a home run 0.5 s after you
see it. How far away are you?
Steve swims 10 m in 20 s. What is his
average speed?
4.
5.
6.
Two cities are 250 km apart. How much
time will it take to travel from one city to
the other at 100 km/h?
If a train travels 120 km at 30 km/h, how
long will it travel?
An eagle flies 300 m in 12 s, what was its
average speed?
```