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SPH3U - Kinematics INTRO TO SPEED /> Where, v = speed, Ad = distance, and At = time interval Example: How long does It take a car to travel 46 m when its average speed is 60.0 m/s? ^ A A1 X L Definition Average Speed (Vavg) VSJ? = Total distance Total time Example A City of Markham bus took 1.0 hours to travel 60.0 km. Vavg = JMMiL = fj* X*// }. Instantaneous Speed (Vm5t) Constant Speed An object's speed at an instant in time The reading on a car's speedometer Speed does not change Car on cruise control on a flat road a situation when... ^ SPH3U Physics Unit: Kinematics Problem Solving with Uniform Motion • • *Definition of "uniform motion" (which you will be expected to know): Uniform motion means constant speed AND direction. Text reference for this concept: p. 14-15, "Average Speed" description and example. Practice Questions: 1. If a car travels 485 m in 13 seconds, what was the car's average speed? [ans 37m/s] 2. A SCUBA diver rides an underwater tricycle at an average speed of 1.74 km/h for 60,0 h. What distance do they travel in this time? [ans 104 km] 3. A truck driver, reacting quickly to an emergency, applies the brakes. During the driver’s 0.32s reaction time, the truck maintains a constant velocity of 27 m/s [FWD]. What distance did the truck move during the time the driver takes to react? [8.6 m] !—> 10 4. An airplane is travelling from Vancouver to Toronto following the jet stream. The plane cruised at an average speed of 1.10 km/h for the 4.00 x 103 km flight. How long did the flight take? If the plane left Vancouver at 3:00 am EST, what time did it arrive in Toronto? [3.6 h; 6:36am] (*lf you can't figure out the answer 6:38am, take your time and try again.) 5. A swimmer crosses a circular pool with a radius of 16 m in 21 s. a) What is the swimmer's average speed? [1.5 m/s] b) If the swimmer were to swim around the circumference of the pool at this same speed, how long would it take? [66 s] 6. OPTIONAL (Challenge question): Two sprinters are racing. Billy has a head start of 3.0 s and is travelling at 8 m/s. Biff travels at 10 m/s. If the race is 200m, who would win? By how much? [Biff wins by 2.0 s] !