Velocity
Speed in a Particular Direction
Velocity - speed in a particular direction
Fill In The Blanks NotesWatch the Animation Below
Velocity is speed in a particular direction. How many velocities does a curveball have? (ignore spin)
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Velocity - Speed in a Particular Direction
How many velocities does this boat have?
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Video Instruction
showmethephysics.com
Enduring Understanding
1. Velocity is the speed in a particular direction.
2. Velocity is the change in displacement per unit time. + is up, right, east and forward.
3. An object can have one speed but 3 velocities. (Curve Ball)
C. Velocity
Speed in a particular direction
Velocity & Direction [ HTML5 ]
showmethephysics.com
Focus on the man walking across this page. Identify his 2 velocities. Which is the greater of the two?
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Ex) Joe Drove 13 Meters Northeast in 2.0 Seconds
What was Joe's...
Northeast displacement? displacement east? displacement north?
We can say that Joe has 3 velocities:
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
Honors Extension
Check Your Understanding
5 quick questions — pick an answer to see if you’re right.
1. What is velocity?
2. Ignoring spin, how many velocities does a curveball have as it travels toward the plate?
3. A car drives 10 m northeast in 2.0 s, which is 8 m east and 6 m north. What is its northward velocity?
4. A runner travels 100. m east in 20. s. What is the runner's velocity?
5. Which of these is correctly written as a velocity?
Tracking a Monarch Butterfly
Each fall, monarch butterflies migrate south to Mexico. Scientists attached a tiny tracking tag to one butterfly. The tag showed that the butterfly flew 36 km due south in 4.0 hours. A storm then blew it 12 km due north in 2.0 hours.
Table 1: Tracking Data
| Interval | Displacement | Time (h) |
|---|---|---|
| 1 | 36 km south | 4.0 |
| 2 | 12 km north | 2.0 |
What was the butterfly’s average velocity for the entire 6.0 hours?
▶ Want a challenge? Open 6 more Regents-style questions (harder · mixed formats)
Challenge score: 0 / 6
C1. What was the butterfly’s average speed for the entire 6.0 hours?
C2. During interval 2, choose the direction of the butterfly’s average velocity and determine its magnitude. (North is up.)
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C3. A student makes the following claim.
Place a check mark in either the Support or Refute box. Justify your response using the data in Table 1.
C4. Substitute numerical values into a mathematical representation that can be used to determine the magnitude of the butterfly’s average velocity during interval 1. Then calculate it.
C5. Taking south as positive, which graph best represents the butterfly’s position versus time?
C6. Scientists want to use the tag data to predict how long the butterfly will take to reach Mexico. Explain whether they should use the butterfly’s average speed or its average velocity, using values from Table 1.
