Date Due: …………… Name: …………………………… Preliminary Physics Assignment 1 Moving About – Speed and Velocity Total: / 32 Answer the questions below in the spaces provided. Show all working! 1. In 2004, cyclist Sarah Ulmer of New Zealand set a world record for 3 minutes and 24.537 seconds for the 3000 m pursuit. (a) Calculate her average speed. 2 …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... (b) Calculate the time taken (in hours) by Sarah to cycle from Sydney to Newcastle, a distance of 155 km, if she could maintain her average speed for the 3000 m pursuit for the whole distance. 2 …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... (c) Calculate the time (in hours) for a car to travel from Sydney to Newcastle if its average speed is 80 km h1 . 1 …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... 2. After a car is driven 5 km in a southerly direction it turns right and travels 12 km in a westerly direction. The journey takes 12 minutes. (a) Calculate the distance it has travelled. 1 …………………………………………………………………………………………... …………………………………………………………………………………………... (b) Calculate its displacement. 3 …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... (c) Calculate the car’s average speed. 1 …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... (d) Calculate the car’s average velocity. 2 …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... 3. The police are pursuing a speeding motorist on a straight road. The speeding car is travelling at 90 km h-1. The police car, initially 200 m behind the speeding car, travels at a speed of 105 km h-1 with lights flashing and siren screaming. Calculate how long it takes the police car to catch up with the speeding car. 3 ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. ………………………………………………………………………………………………. 4. The figure below shows how the displacement of an object changes with time. (a) During which section/s of the interval was the object stationary? ……………………. 1 (b) During which section was the object travelling north? ……………………. 1 (c) What was the total displacement of the journey at the end of the 22 s interval? ……………………. 1 (d) What distance did the object travel during the 22 s interval? 1 …………………………………………………………………………………………... …………………………………………………………………………………………... (e) What was the average speed during the entire interval? 1 …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... (f) What was the velocity of the object through section D? 2 …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... 5. The graph shows how the velocity of an object moving from X to Y changes over time. (a) At what time(s) was the object at rest? ……………………. 2 (b) During which sections was the acceleration of the object zero? ……………………. 1 (c) What was the average speed of the object during the entire interval? 3 …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... (d) What was the average velocity of the object during the interval? 2 …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………... (e) Calculate the acceleration of the object throughout section E. 2 …………………………………………………………………………………………... …………………………………………………………………………………………... …………………………………………………………………………………………...
