 MCAS Physics Exams MCAS 2012 Session 1                     Open-Response Questions
• BE SURE TO ANSWER AND LABEL ALL PARTS OF THE QUESTION.
• If you do the work in your head, explain in writing how you did the work.

Refer to the following information for the next four questions. a.  In your Student Answer Booklet, draw the parallel circuit using all the circuit components shown. Place the ammeter in the circuit so that it measures the total current of the circuit.

 b.  Calculate the current flowing through the resistor. Show your calculations and include units in your answer.

 When the circuit is operating, the ammeter measures a total current of 1.5 A. c.  Determine the resistance of the light bulb. Show your calculations or explain your reasoning. Include units in your answer.

 d.  Describe one change that would result if the light bulb and resistor were placed in series instead of in parallel.

Refer to the following information for the next four questions. a.  Calculate the object’s acceleration before the 8.0 N force is applied. Show your calculations and include units in your answer.

 b.  Calculate the object’s acceleration after the 8.0 N force is applied. Show your calculations and include units in your answer.

 c.  Is the direction of acceleration in parts (a) and (b) the same or different? Explain your answer. The object is then pushed onto a slightly rough surface that exerts an additional 20 N frictional force to the left on the object.

 d.  Will the object come to rest on the slightly rough surface? Explain your answer.