Video Instruction
showmethephysics.com
A curveball has more than
one measureable motion.
How many does it have? (ignore spin)
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3 Motions
Forward,
Left (or Right),
Down
Velocity - Speed in a particular direction
How many velocities does this boat have?
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C. Velocity - speed in a particular direction
[ HTML5 ]
St. Mary's H.S.
Focus on the man walking across this page.
Identify his 2 velocities. Which is the greater of the two?
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The answer depends on your coordinate system. The man is moving to the north (or up, forward, y) and the east (or across, to the right, x). Since his easterly displacement is greater, he has a greater easterly velocity
Ex) Joe drove 13 meters North East in 2.0 seconds
What was Joes ...
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Northeast displacement?
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displacement east?
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displacement north?
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Northeast displacement? 13 m NE
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displacement east? 12 m E
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displacement north? 5.0 m N
Ex) Joe drove 13 meters North East in 2.0 seconds
We can say that Joe has 3 velocities
V = 6.5 m/s N.E.
V = 5 m N/2 seconds =
2.5 m/s North
V = 12 m East/2seconds
= 6 m/s East
1. Velocity is always written with direction
Examples
• 5.0 m/s east
• +5.0 m/s
• 100 m/s downward
• -100 m/s
2. Equation:
V = ∆d/∆t
For straight line motion:
V = distance/time and direction
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