1.2 – Speed measures how fast position changes
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Transcript 1.2 – Speed measures how fast position changes
Section 1.2
Speed measures how fast
position changes.
MRS. LEOS
How far is Wet ‘n Wild?
What
are different ways to
describe how far somewhere is?
EXPLORE: (page 16)
How can you measure speed?
PURPOSE: To introduce the relationship
among speed, distance, and time.
How can you measure speed?
Read through procedure on pg 16
Answer What do you think Questions in ISN.
Position can change at different
rates.
Speed
is a measure of how fast something
moves or the distance it moves, in a given
amount of time.
The
greater the speed an object has,
the faster it changed position.
Look at the picture on p 17
What does each group of numbers in a box
represent?
How can you tell which cyclist is pedaling
faster?
How far will each rider travel in 5 seconds?
Calculating Speed
Distance
and time measurements
The formula for speed (average)
Speed
= Distance/Time
S = d/t
Let’s practice!
A wheelchair racer completes a 100-meter
course in 20 seconds. What is his speed?
A dog runs 200 m in 25 s on the beach.
What is his speed? Raise your hand
when you know the answer
If a remote-control car travels 100 m in
50 s, what is its speed?
Check your reading
If two runners cover the same distance in
different amounts of time, how do their
speeds compare?
Average Speed
Instantaneous speed (moment-to moment speed) is
hard to measure, therefore it is easier to calculate
your average speed
Distance-Time Graphs
Shows how speed relates to distance and time
TIME is on the x- axis (horizontal)
DISTANCE is on the y-axis (vertical)
IN YOUR OWN WORDS SUMMARIZE bullets 1,2,3
Calculating Speed from a Graph
How fast is the zebra walking during the first
20 seconds?
Practice Math problems
Reading Visuals-Page 21
How do the distances change over each 10
second time interval?
Velocity includes speed and
direction
Velocity= speed in a specific direction
Example: walking east at a speed of three meters
per second
Vector: a quantity that has both size AND direction
(velocity)
Two objects can have the same speed but different
velocities (same speed, different directions)
On page 26 (left side of notebook),
demonstrate your understanding of
Section 1.2
Write your summary ( 5-7 sentences)