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# Speed

Introduction or make-up to the speed calculation
by

## Rod Williams

on 13 October 2014

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#### Transcript of Speed

Here are some problems ...
1) Find Speed
2) Find Distance
3) Find time
Speed
Speed
- a measure of the rate of change
- how fast position changes
- to calculate speed
Speed equals distance divided by time
S
=
d
t
/
SPEED
EQUALS
Divided by
Time
Distance
So ...
d
s
t
Units for these quantities are :
speed =
meters per second
(m/s)
distance =
meters
(m)
time =
seconds
(s)
1) find speed
2) find distance
3) find time
A bike rider travels 500 m in 25 seconds. What is his speed?
s = d / t
so ...
s =
500 m
/
25 s
s =
20 m / s
Now you try a few...
a) A swimmer covers 150 m in 75 seconds. What is her speed?
b) A car travels 1,200 meters in 200 s. What is its speed?
A rabbit is running at 8 m/s. How far will it go in 4 seconds?
d =
s X t
so ...
d =
8 m/s
X
4 s
d =
32 m
Now you try a few ...
a) A snake slithers along at 2.8 m/s. How far will it go in 18 seconds?
b) A shark swims through the Gulf of Mexico at 5.3 meters per second. How far will it go in 12 s?
A car covers a distance of 575 meters, while traveling at 25 m/s. How long does this take?
t =
d / s
so ...
t =
575 m
/
25 m/s
t =
23 s
Now you try a few ...
a) How long does it take to go 25 meters at a speed of 1.75 m/s?
b) A baseball is thrown at 72 meters per second. How long does it take to get to home plate 12 m away?
You should now be able to complete the speed assignments. When you are finished, you may take the speed party. Good Luck!
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