Introduction to Physics Primer 

Lesson 4 - Answers to Suggested Problems

by Jason Harlow


After you have had a chance to try the suggested end-of-chapter conceptual questions, problems and exercises, you can check your answers against mine below. (Please alert Jason Harlow jharlow@physics.utoronto.ca if you notice any errors in the answers.)


Conceptual Questions
13. Yes.  When turning at constant speed, the acceleration is not zero, since the direction of the velocity is changing.

14. No.  If the velocity is constant, the acceleration must be zero, since the acceleration is the rate of change of velocity.
15. Example: A ball rolls up an incline.  When it gets to the top, its velocity is zero momentarily, but its acceleration is not zero.
16. To the right.  Positive.

Problems and Exercises
16. 4.29 m/s2
18. (a) 1.43 s (b) 2.50 m/s2