Speed Monroe January 32, 2008. Speed ~ distance divided by time Continents move in centimeters per year Airplanes in kilometers per hour American cars.

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Presentation transcript:

Speed Monroe January 32, 2008

Speed ~ distance divided by time Continents move in centimeters per year Airplanes in kilometers per hour American cars in miles per hour Comets in miles per second Bullets in feet per second These are all measurements of speed

Average speed is over a longer period of time. If Sam Swiftfoot can run 10 miles in 73 minutes, what is his average speed?

Average speed is over a longer period of time. If Sam Swiftfoot can run 10 miles in 73 minutes, what is his average speed? 10 miles60 minutes8.22 miles x = minutes1 hourhour

Instantaneous Speed ~ is the speed during an instant of time. Look at your speedometer for a good idea. There really is no such number as instantaneous speed, however, because one can always reduce time until it reaches zero, at which time the number becomes undefined. One cannot divide by zero.

Velocity ~ is the speed in GIVEN DIRECTION. This implies displacement instead of distance.

Distance ~ is how far you move, along the face of the Earth, compared to a reference point.

Velocity ~ is the speed in GIVEN DIRECTION. This implies displacement instead of distance. Distance ~ is how far you move, along the face of the Earth, compared to a reference point. Displacement ~ is the distance between the starting point and the ending point of a movement.

A horse took 15 seconds to run around an oval track, that was 1/4 mile in length. What is the total distance that he ran?

A horse took 15 seconds to run around an oval track, that was 1/4 mile in length. What is his total displacement?

A horse took 15 seconds to run around an oval track, that was 1/4 mile in length. What was his average speed?

A horse took 15 seconds to run around an oval track, that was 1/4 mile in length. What was his average velocity?

What is the average speed of Chuck Norris, as he pursues the evil doers in the path shown below? Time is 25 minutes. 14 kilometers 24 kilometers 14 kilometers Crime scene Arrest made in fast and heroic action

What is the average speed of Chuck Norris, as he pursues the evil doers in the path shown below? Time is 25 minutes. 14 kilometers 24 kilometers 14 kilometers Crime scene Arrest made in fast and heroic action 52km÷25 min = 2.08km/min

What is the average velocity of Chuck Norris, as he pursues the evil doers in the path shown below? Time is 25 minutes. 14 kilometers 24 kilometers 14 kilometers Crime scene Arrest made in fast and heroic action

What is the average velocity of Chuck Norris, as he pursues the evil doers in the path shown below? Time is 25 minutes. 14 kilometers 24 kilometers 14 kilometers Crime scene Arrest made in fast and heroic action 24 km ÷ 25 min =.96km/min

What is the average speed of Chuck Norris, as he pursues the evil doers in the path shown below? Time is 25 minutes. 14 kilometers 24 kilometers Crime scene Arrest made in fast and heroic action

What is the average speed of Chuck Norris, as he pursues the evil doers in the path shown below? Time is 25 minutes. 14 kilometers 24 kilometers Crime scene Arrest made in fast and heroic action 38 km ÷ 25 = 1.52 km/min

What is the velocity of Chuck Norris, as he pursues the evil doers in the path shown below? Time is 25 minutes. 14 kilometers 24 kilometers Crime scene Arrest made in fast and heroic action

What is the velocity speed of Chuck Norris, as he pursues the evil doers in the path shown below? Time is 25 minutes. 14 kilometers 24 kilometers Crime scene Arrest made in fast and heroic action =X km/min

How does displacement differ from distance?

How can speed be defined? a.Change in speed divided by time b.Change in velocity divided by time c.How fast velocity is changing d.How much force is placed on an object

What is the formula for speed? a.Speed divided by time b.Time divided by velocity c.Distance divided by time d.Distance divided by velocity

What does the slope on a distance/time graph indicate? a.Displacement b.Velocity c.Time d.Speed

Which person is moving most quickly? Distance Time A B C

Which person is moving most quickly? Distance (km) Time (min) A B C