This Sample Quiz is provided to give you some idea of the types of questions that could be asked on your Problems Class quiz covering this material.  It in no way promises that the material on your quiz will be the same as that covered here.  The quizzes are written by the individual Problems Class instructors! Nevertheless, if you are prepared for the quiz, you should be able to answer the questions below.

A coffee cup of mass 230 g sits on a flat, horizontal table top. You push the cup across the table top with a constant speed of 3.2 cm/s.  To do this, you must exert a horizontal  force of magnitude 0.45 N. 

1. What is the magnitude of the normal force acting on the cup?

(a) 0 N    (b) 0.23 N  (c) 2,250 N    (d) 2.25 N    (e) 0.45 N

2. What is the magnitude of the frictional force acting on the cup as you push it?

(a) 0 N    (b) 0.23 N  (c) 2,250 N    (d) 2.25 N    (e) 0.45 N

3. What is the value of the coefficient of kinetic friction between the table top and the cup?

(a) 0    (b) 0.73    (c) 0.45    (d) 0.2   (e) 0.05

4. State the challenge for today’s Activity, and give the general idea of how you intend to approach this challenge. Be brief!