2 Kinematics - BC Science Physics 11

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Practice Problems 2.1.1 — Calculating Displacement (Continued) 2. The diagram below shows the displacements of a golf ball caused by a rookie golfer attempting to reach hole number 7 on Ocean View Golf and Country Club. The golfer requires six shots to put the ball in the hole. The diagram shows the six displacements of the ball. �� (a) What is the total distance the golf ball travelled while the golfer was playing the seventh hole? (b) What is the resultant displacement of the ball? 3. What is the total distance and displacement the dog takes after it leaves the front porch? Speed �� The speed of an object such as a car is defined as the distance it travels in a unit of time. For highway traffic, speeds are measured in kilometres per hour (km/h). Typical highway speed limits are 80 km/h, 100 km/h, and 120 km/h. Within city limits, speed limits may be 60 km/h, 50 km/h, or 30 km/h (school zone or playground). The average speed of an athlete in a 100 m dash might be approximately 9.0 m/s. The speed of sound is 330 m/s, while the speed of light is approximately 300 000 000 m/s or 300 000 km/s. 40 Chapter 2 <strong>Kinematics</strong> © Edvantage Interactive 2012 ISBN 978-0-9864778-3-6
Quick Check If you make a long journey by car, you might be interested in calculating your average speed for the trip. For example, if you travel a distance of 450 km in a time of 6.0 h, you would calculate your average speed by dividing the total distance by the total time. average speed = total distance total time © Edvantage Interactive 2012 ISBN 978-0-9864778-3-6 Chapter 2 <strong>Kinematics</strong> 41 = 450 km 6.0 h = 75 km/h The symbol used for speed is v, and for average speed, v. Note that it is a line above the v is not an arrow. The formula for calculating average speed from distance (d) and time (t) is therefore: v _ = d t If you are driving along the highway and spot a police car parked beside the road with its radar aimed at your car, you will be less interested in your average speed and more concerned with your instantaneous speed. That is how fast your car is going at this instant in time! Your speedometer will indicate what your instantaneous speed is. 1. (a) What is the difference between average speed and instantaneous speed? (b) Under what condition may average speed and instantaneous speed be the same? 2. A tourist travels 320 km in 3.6 h. What is her average speed for the trip? 3. A trucker travels 65 km at an average speed of 85 km/h. How long does the trip take? 4. If your car averages 92 km/h for a 5.0 h trip, how far will you go?
Page 1 and 2: 2 Kinematics By the end of this cha
Page 3: The ∆ sign is important because i
Page 7 and 8: Sample Problem 2.1.2 — Solving Mo
Page 9 and 10: Investigation 2-1 Measuring the Spe
Page 11 and 12: 6. If your car moves with a steady
Page 13 and 14: Sample Problem 2.2.1 — Calculatin
Page 15 and 16: By inspection, the y-intercept, b,
Page 17 and 18: 4. A racing motorbike’s final vel
Page 19 and 20: Sample Problem 2.3.1 — Determinin
Page 21 and 22: Calculating Distance from Uniform A
Page 23 and 24: Investigation 2-3 Measuring Acceler
Page 25 and 26: Concluding Questions 1. (a) What wa
Page 27 and 28: 5. An aircraft starts from rest and
Page 29 and 30: Sample Problem 2.4.1 — Free Fall
Page 31 and 32: Quick Check ��
Page 33 and 34: Chapter 2 Review Questions 1. What
Page 35 and 36: 11. A woman biker (leader of the lo
Page 37 and 38: Chapter 2 Extra Practice 1. The spe

2 Kinematics - BC Science Physics 11

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