PHYS 101 Lecture Notes - Lecture 4: Circular Motion, Conservative Force
15 May 2018
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Phys 101: Tutorial 4. Circular motion and Introduction to Work
Instructions: Print and bring with you to your tutorial. Read it over, but do NOT work on until your
tutorial time. Bring a calculator.
Question 1:
Watch the youtube video ‘Running through a loop-the-loop’ under Physics media/videos on the Canvas
page. You’re going to calculate the speed that Damien needs to be running at to make it through the
loop.
a) Draw a free-body diagram showing the force of the track pushing on the runner and the
gravitational force on the runner at the bottom of the loop. Draw the vectors roughly to scale
relative to each other.
b) Draw a free-body diagram showing the force of the track pushing on the runner and the
gravitational force on the runner at the top of the loop.
Document Summary
Instructions: print and bring with you to your tutorial. Read it over, but do not work on until your tutorial time. Watch the youtube video running through a loop-the-loop" under physics media/videos on the canvas page. In the video, the lady calculates it to be 8. 65 miles/hour. Draw free body diagrams and the direction of the centripetal acceleration for all of the following situations undergoing uniform circular motion: a car going around a banked curve at a constant speed without slipping. There is friction between the person and the wall. Question 3: work done by different forces: work done by friction (a non-conservative force). You push a box across the floor and the floor exerts a constant friction force on the box with a magnitude of 30 n as you push. Calculate the work done by friction in moving the box from position a to position b.
