This Sample Quiz is provided to give you some idea of the types of questions that could be asked on your Problems Lab 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 Lab instructors! Nevertheless, if you are prepared for the quiz, you should be able to answer the questions below.

1. A force is something that

(a) holds an object stationary.

(b) is required to keep an object moving.

(c) is required to change an object’s motion.

(d) gives an object it mass.

(e) equals weight divided by mass.

2. An object of mass 3.7 kg is moving with a velocity of 2.5 m/s in the positive x-direction at an instant when its acceleration is 0.52 m/s² in the positive x-direction.  What can you say about the net force that it is experiencing at this instant?

(a) The force is constant.

(b) The force is 1.92 N in the positive x-direction.

(c) The force is 9.25 N in the positive x-direction.

(d) The force is 7.12 N in the positive x-direction.

(e) the force is a function of time — we need the value of t before we can answer the question.

3. Explain the meaning of the normal force.

4. A cup of coffee of mass 210 g is sitting on a horizontal table top. Draw a good FBD for the cup.

5. Use Newton’s 2nd law in component form to find the value of the normal force acting on the coffee cup in the problem above.