Chapter2 p1
description
Transcript of Chapter2 p1
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Kinematics –a branch of physics; study of motion
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Speed vs. Velocity *Speed is a scalar (how fast
something is moving regardless of its direction). Ex: v = 20 mps
*Speed is the magnitude of velocity. *Velocity is a combination of speed
and direction. Ex: v = 20 mps at 15 south of west
*The symbol for speed is v. *The symbol for velocity is type
written in bold: v or hand written with an arrow: v
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Mass vs. Weight
On the moon, your mass would be the same, but the magnitude of your weight would be less.
Mass• Scalar (no direction)• Measures the amount of matter in an
objectWeight• Vector (points toward center of
Earth)• Force of gravity on an object
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Some Physics Quantities Scalars ----------- Vectors • Distance ---------
Displacement• Speed ------------ Velocity• Mass ------------- Weight•Time ----------------------------• Energy -------------------------• Magnitude -------
Acceleration• Magnitude ------- Force
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Some Units
Quantity .………………... Unit
(symbol)
Displacement & Distance ….…
meter (m)
Time ………………………….second
(s)
Velocity & Speed
……………….(m/s)
Mass ………………………kilogram
(kg)
Force ……………………….Newton
(N)
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Some “SI Prefixes”
nano n 10-9
micro µ 10-6
milli m 10-3
centi c 10-2
deci d 10-1
deka da 101
hecto h 102
kilo k 103
mega M 106
giga G 109
Little GuysBig Guys
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Another problem: A car travels 10,000 meters in 5 minutes, what is the car’s speed?
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“Distance versus Time” Graphs
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Graphing
A … Starts at home (origin) and goes forward slowly
B … Not moving (position remains constant as time progresses)
C … Turns around and goes in the other direction quickly, going back home.
1 – D Motion
x
t
AB
C
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SPEED IS THE SLOPE OF THE DISTANCE VERSUS TIME
GRAPH
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DISTANCE VS. TIME GRAPHS
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Graphing Animation Link
This website will allow you to set the initial velocity and acceleration of a car. http://www.walter-fendt.de/ph14e/acceleration.htm
Car Animation
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Thank you for being
with us.Have a nice
day