Chapter 2 skill building

Chapter 2 Skill Building
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Unformatted text preview: MasteringPhysics: Assignment Print View Given Positions, Find Velocity and Acceleration Learning Goal: To understand how to graph position, velocity, and acceleration of an object starting with a table of positions vs. time. The table shows the x coordinate of a moving object. The position is tabulated at 1-s intervals. The x coordinate is indicated below each time. You should make the simplification that the acceleration of the object is bounded and contains no spikes. time (s) 1 2 3 4 5 6 7 8 9 x (m) 1 4 9 16 24 32 40 46 48 Part A Which graph best represents the function x(t), describing the object's position vs. time? ANSWER: 1 2 3 4 Part B MasteringPhysics: Assignment Print View Which of the following graphs best represents the function v(t), describing the object's velocity as a function of time? Part B.1 Part not displayed Hint B.2 Hint not displayed Part B.3 Part not displayed Part B.4 Part not displayed ANSWER: 1 2 3 4 Part C Which of the following graphs best represents the function a(t), describing the acceleration of this object? Part C.1 Part not displayed Part C.2 Part not displayed Hint C.3 Hint not displayed ANSWER: 1 2 3 4 A PSS is a problem solving strategy. They appear throughout the text. Pay serious attention to learning how to apply the strategy to all of your homework problems. In particular, get in the habit of using motion diagrams, and pictorial and graphical representations. PSS 2.1: Can't Hit the Can! MasteringPhysics: Assignment Print View Learning Goal: To practice Problem-Solving Strategy 2.1 for problems involving kinematics with constant acceleration. A car is traveling at a constant velocity of magnitude when the driver notices a garbage can on the road in front of him. At that moment, the distance between the garbage can and the front of the car is . A time after noticing the garbage can, the driver applies the brakes and slows down at a constant rate before coming to a halt just before the garbage can. What is the magnitude of the car's acceleration after the brakes are applied? MODEL: Use the particle model. Make other appropriate simplifying assumptions. VISUALIZE: Use different representations of the information in the problem. Draw a motion diagram . Motion diagrams are part of the physical representation. Draw a pictorial representation . This helps you assess the information you are given and starts the process of translating that information into mathematical symbols. Use a graphical representation if appropriate for the problem. Go back and forth between these three representations as needed. SOLVE: The mathematical representation is based on the three kinematic equations , , and . Use or , as appropriate to the problem, rather than the generic ....
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