chapter 11 powerpoint notes
DESCRIPTION
Speed NotesTRANSCRIPT
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MOTION
Chapter 11
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Measuring Motion
Motion of an object must be observed within a frame of reference.
Frame of reference – describes the motion of an object relative to fixed points.
What is the fixed point in the photograph?
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Distance and displacement
Distance measures how far or the length of the motion.
Displacement not only measures how far but in what direction.
• 50 MILES
50 MILES WEST
• DISPLACEMENT MUST DESCRIBE WHERE THE OBJECT IS MOVING.
• (NORTH, SOUTH, EAST, WEST, UP, DOWN, TOWARD SPRINGFIELD ETC.)
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Speed and Velocity
Speed describes how fast an object moves.Speed = distance What does this mean?
time
The units for speed are (m/s, km/h, mi/h etc)
Velocity describes how fast and in what direction.
Don’t forget to include the direction. This
dog has a velocity of 10 mi/h to the east! Golly, he’s
fast. Or is he?
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Let’s work some problems, shall we.
Write the equation for speed.
S = DT
Could we rewrite this so we don’t have a fraction?
YES HOW?Get rid of the T by multiplying both sides by T
and there you have it! S x T = D x T T
ST = D
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Okay, now for some practice
A twizzler is 16 cm in length and you can eat the entire twizzler in 45 seconds. What is your twizzler eating speed?
Equation D = ST or S = D/THere we go… Plug in your numbers to the
appropriate spot.D = 16 cm X = 16 cmT = 45 sec 45 secS = X X =
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Distance vs. time graph
You can determine the speed, distance and time of an object by reading a distance vs time graph.
1 2 30
10
20
30
40
50
60
70 Distance vs. time
doghorsemouse
Time (s)
Distance(m)