KINEMATICS: Episode I How far did it go? How fast did it travel?

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Presentation transcript:

KINEMATICS: Episode I How far did it go? How fast did it travel?

Go Speedracer!! Go!! Part 1 Using metersticks and stopwatches, record the time it takes for the racecar to travel 3 meters. Record the time at 30 cm intervals in a table containing both time and distance.

Distance (d): How far something travels in changing position (total) EX. I live 5 miles from NPHS. Where do I live? Scalar Quantity A quantity that has magnitude (size) only. No direction. Ex. Mass, time, temperature

Δt S = d OR AVERAGE SPEED (S) Def: The total distance traveled Time to travel distance S = d Δt OR *Where the bar means average and Δ means change *SCALAR quantity

British Engineering Standard: feet/second OR ft/s *miles/hour (mph) SI UNITS: meters/second OR m/s *km/hr more common British Engineering Standard: feet/second OR ft/s *miles/hour (mph) more common *quick convert: mph ≈ twice m/s Conversion 1 m/s = 3.6 km/h = 2.24 mi/h 1 mph = 1.609 km/hr = 0.447 m/s

Instantaneous Speed Speed at a specific instant in time

Usain Bolt holds the record for the 100m dash at 9.58 seconds. Find his average speed in : a.) m/s b.) km/hr c.) mph 100 m/9.58 sec = 10.44 m/s 10.44 m/s X (7.2 km/hr) = 37.58 km/hr ( 2 m/s ) 10.44 m/s X (4.5 mph) = 23.49 mph (2 m/s)

Go Speedracer!! Go!! Part 2 Calculate the racecar’s average speed for each interval and the entire trip. Use your data to plot a graph of the position of the car versus time.

Complete “Investigating Travel in the Halls of NPHS” Average Speed Analysis table. *Don’t use rounded numbers (the ones recorded in table)—use originals for each speed unit!