PEC152 2013 Semester 1 Assignment 1
Problems Chapters 2 to 8.4
Marking Key
? A good diagram 20% of the marks
o Correct, clear and a reasonable size
o Putting on the diagram / listing all known factors

? Explaining the physics involved 30% of the marks
o Correctly and in depth which may include stating assumptions if there are any

? Giving the equations that will be used in their general terms 10% of the marks

? Calculations leading to a correct answer 40% of the marks
o The correct SI units
o An appropriate number of significant figures

Problem 1

http://phet.colorado.edu/en/simulation/moving-man
Describe, in detail, the motion of the man as represented in the graphs. You might find it useful to visit the website and play with the simulation to get a feel for what is going on,
In your description give a start and end time for each part of the motion.
Give the overall displacement of the man and the total distance he has travelled.
Problem 2
a) Evel Knievel became famous for jumping over things on a motorbike. On March 25 1967 he did his first jump for a TV sports channel and managed to clear 15 cars (90 feet). Assuming his take-off angle was 45 degrees and air resistance was negligible (which it is not) what would his velocity (m/s) have to be just before he left the take-off ramp?

Video of jump http://www.youtube.com/watch?v=9SGNFEwuxKQ
b) On May 31, 1975 he performed his last jump at Wembley Stadium UK. He attempted to jump over 13 busses and had to reach 90 miles per hour at the take-off to do this. Unfortunately the take-off ramp was not long enough for him to achieve this and he landed ”just shy” of the landing ramp breaking his pelvis again. The big red London busses were 2.43m wide. If he had been able to reach his desired speed what would his maximum height above the busses have been if you could ignore air resistance?
c) It is not possible to ignore air resistance. Compare the distance he wanted to cover…