motion - katy independent school...
TRANSCRIPT
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MOTION
When an object changes position in relation to a reference point over a
period of time, the object is
in motion.
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Motion is Relative
You must watch the object that is
moving in relation to another
object that appears to stay in
place.
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REFERENCE POINT
A fixed place on Earth’s surface from which
direction and location can be described is
a reference point.
When an object is in motion, you can
describe the direction of its motion using a
reference direction.
Ex. North, South, Up, Down
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Determine if an object is in motion
Take Off!
After 30 Minutes
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SPEED
The rate at which an object moves is
speed.
Speed depends on two things:
the distance traveled
the time taken to travel that distance
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How do you calculate speed?
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Calculating Speed
Speed is distance divided by time.
Speed = Distance ÷ Time
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Calculate this Speed:
A football field is about 100
m long. If it takes a person
20 seconds to run its length,
how fast was the football
player running?
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Calculate this Speed:
Speed =
Speed =
Time
Distance
sec20
100m= 5 m/sec
Remember
to include
the UNITS!!
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Speed Brain Food
The list below shows a comparison of
some interesting speeds:
• Cockroach 1.25 m/s
• Kangaroo 15 m/s
• Cheetah 27 m/s
• Sound 340 m/s
• Space Shuttle 10,000 m/s
• Radiant Light 300,000,000 m/s
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Constant Speed Is
Speed that does
not change
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Are you always traveling at a
constant speed?
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Average Speed
Most of the time, objects do not travel at a
constant speed. For example, you
probably do not walk at a constant speed
from one class to the next. Calculating
average speed using a formula is very
useful.
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Average Speed Formula:
Average Speed = Time Total
Distance Total
Average Total Total
Speed = Distance ÷ Time
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Find the Average Speed:
A bird flies a distance of
100 m, 150 m, and 200 m in
a total time of 50 seconds.
What is the bird’s average
speed?
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Find the Average Speed:
Total Distance = 100m + 150m + 200m
= 450 m
Avg. Speed =
Avg. Speed =
Avg. Speed = 9 m/sec
Time Total
Distance Total
sec50
450mRemember
to include
the UNITS!!
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Velocity
Velocity is the speed of an
object in a particular direction.
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Be careful! Speed & Velocity are not the same thing!
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Distinguish Between Speed and Velocity
Speed describes distance and time
Velocity describes distance, time,
and direction.
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Velocity or Speed?
An airplane travels
600 km/h.Is this describing the airplane’s speed or
velocity?
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Speed
because there is no direction!
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Velocity or Speed?
A car travels
75 km/h west on I-10.
Is this describing the car’s speed or
velocity?
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Velocity because there is a
direction!
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Motion Riddle:
Two birds leave the same tree at
the same time. They both fly at
10 km/h for 1 hour, 15 km/h for 30
minutes, and 5 km/h for 1 hour.
But they don’t end up at the same
place. Why not?
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Riddle Answer
The birds went in different
directions!
The birds had the same
speed but had different
velocities.