1 / 13

Speed measures how fast position changes

Speed measures how fast position changes. distance. Speed. =. time. distance. Speed . Speed is how fast positions change with time. 00:00. 00:02. Speed . A measure of how fast something moves through a particular distance over a definite time period. You try.

taryn
Télécharger la présentation

Speed measures how fast position changes

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Speed measures how fast position changes

  2. distance Speed = time distance Speed Speed is how fast positions change with time 00:00 00:02

  3. Speed • A measure of how fast something moves through a particular distance over a definite time period.

  4. You try • Suppose a race is 50 m and it takes an athlete 15 seconds to run it. Is that enough information to calculate the runner’s speed? • Think-pair-share (2 minutes) • YES, the formula for speed = distance time

  5. Average speed • Imagine taking a road trip with your friends or family. When you travel in your car do you stay at a constant speed? THIS IS YOUR AVERAGE SPEED

  6. Average speed • Usually objects do not travel at a constant speed. • Do you run at a constant pace when you run for a mile in PE class? • Think about when you are riding somewhere and you hit traffic. • It is more useful to calculate an objects average speed using the following equation:

  7. Average speed example • Think about when you meet your friends at the movies • You say “I’ll meet you there in 20 minutes.” • Are you traveling at a constant rate for 20 minutes? • No, instead we average the speed. We went 5 miles in 20 minutes so what is my average speed to meet your friends at the movies? • .25miles/minute

  8. Average vs. Instantaneous speed • During a typical trip to school, your car will undergo a series of changes in its speed. If you were to inspect the speedometer readings at regular intervals, you would notice that it changes often • The speedometer of a car reveals information about the instantaneous speed of your car. • Instantaneous speed- speed at a particular instant in time. (NOT AVERAGE SPEED)

  9. Average vs. Instantaneous Speed • Average speed • Measure of distance traveled in a given period of time. • Ratio: distance per time

  10. Average vs. Instantaneous speed • Suppose that during your trip to school you traveled a distance of 5 miles and the trip lasted 0.2 hours (12 minutes) • What is your average speed? • Average speed= 5 miles/0.2 hours= 25mph • What is your instantaneous speed? • Speed at the particular moment you looked at the speedometer

  11. Formulas • Speed= Distance/time • How would average speed differ? • Average speed = Total Distance/Total Time

  12. Problem 1: • If your great aunt Betty traveled 2500miles from LA to New York in 4 hours, what is the average speed of the airplane?

  13. Problem 2: • It takes you 9 minutes to run 1 mile. • What is your average speed in miles per minute? • In miles per hour? • .11 miles/minute • 6.67 miles/hour

More Related