Speed and Velocity Notes

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Presentation transcript:

Speed and Velocity Notes Speed = Distance / Time mph Motion Time Direction Distance km/hr

Speed and Velocity Speed Measures the change in distance over a period of time Units include a distance and a time EX: mph, km/hr, m/s

Speed and Velocity D S T Speed Formula is speed = distance time We can use this relationship triangle to help us manipulate the variables D S T

Speed and Velocity Examples: A cheetah can run about 280 miles in 4 hours, what is its speed?

Speed and Velocity Examples: What is my speed if I blink my eyes as fast as possible for 30 seconds? What units should we use in our answer?

Speed and Velocity Examples: A plane’s speed is 400 mph and was able to travel 1200 miles. How long did this trip take?

Speed and Velocity Average Speed the total distance traveled divided by the total time Balances out fast and slow periods of motion during a trip

Speed and Velocity Examples James ran his first 400 meter lap in 70 seconds. His second lap took him 72 seconds. His third lap was 73 seconds. James completed his fourth lap in 69 seconds. Find his average speed in m/s.

Speed and Velocity Velocity Measures a change in position over a period of time AND in a certain direction Uses the same formula as speed

Speed and Velocity Examples A plane traveling from Los Angeles to Atlanta is traveling 2000 miles in 4 hours, what is its velocity?

Speed and Velocity Review: Can speed be negative? Why or why not? If you had the formula S = D/T, how would you rewrite it to solve for distance? When is a time you would need to find the average speed? What is the difference between measuring speed and measuring velocity? Review:

Marble Trials Practice: 1. Roll a ball along the table and record the time and distance Calculate the speed 2. Roll a ball and record the time it takes to roll 30 cm 3. Roll a ball for 5 seconds along the table and measure the distance it traveled 4. Roll a marble for 30 cm and record the time it takes. Calculate the velocity. Practice: