 MCAS Physics Exams MCAS 2004 Session 1 The force of gravity on an object depends primarily on the object’s An archer pulls back the bowstring to prepare to shoot an arrow as shown below. She uses an average force of 40 N, moving the bowstring 0.2 m. How much energy is stored in the bow? The illustration below shows a car slowing down. The car was initially traveling at 15 m/s. The car slows with a negative acceleration of 4.5 m/s2. How long does it take the car to slow to a final velocity of 4.0 m/s? What is the mass of an asteroid with a speed of 200 m/s and a momentum of 2,000 kg • m/s? What property of electromagnetic waves makes it possible to use these waves to transmit information between a space shuttle and NASA mission control centers on the ground? Which of the following is the best example of a wave? Which of the following is certain to change as a ball accelerates? The diagram below shows two aluminum spheres. Aluminum sphere A contains a small negative charge and is touched by aluminum sphere B, which has a larger negative charge. Which of the following occurs next? Which of the following is designed to transform an electromagnetic wave into a mechanical wave? Two forces act on the 2 kg box shown below. A 4-N force acts to the right and a 6-N force acts to the left. What is the net force acting on the box?

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 three questions. The chart below shows the position of a car moving in a straight line. a. Use the data in the chart to draw and correctly label a position versus time graph.

 b. Based on the data in the chart, what is the average speed of the car in m/s from 0 s to 40 s?

 c. Based on the graph that you have drawn, describe the acceleration of the car.