As in the case of multiple choice questions, free response questions in the AP Physics Exams are designed to test your knowledge, understanding and capability for applying the things you have studied. But unlike the multiple choice questions, the presentation of the answers of free response questions is very important since you have to give all the required details in an effective manner within the stipulated time.
Here are two free response practice questions on kinematics. Question No.1 is for AP Physics B; but it will be useful for AP Physics C aspirants also. Question No.2 is for AP Physics C only.
(1) Points A, B and C lie on a straight line parallel to the X-axis in a region of space where a small uniform electric field E directed along the negative X-direction exists. Other fields (including gravitational field) are negligible. A proton of mass m and charge e is projected from point B with velocity u along the positive X-direction.
(c) Determine the time T required for the proton to attain the maximum displacement BC and indicate this time T in the velocity–time graph.
(d) Determine the maximum displacement BC.
The above questions carry 15 points each. You can take about 17 minutes for answering question No.1 and about 15 minutes for answering question No.2. Try to answer these questions. I'll be back soon with model answers for your benefit.