Representations of Motion

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Metropolitan Community College, Omaha *

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Course

1034

Subject

Physics

Date

Dec 6, 2023

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doc

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7

Uploaded by BrigadierLlama1373

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Motion with Moving Man SIM Representations of Motion For this homework assignment, you will need to use the Moving Man Exploration available here: . As you work through these problems focus on making sense of the motion graphs and discuss your reasoning with your peers! What is the graph really telling you about the motion? Graphs are used in science and many other areas (!) to record and convey a whole lot of information, just like a photo of the foothills conveys a whole lot of information about the area we live in. They provide a compact way to tell the whole history of an object's motion. 1) (0.5 pts) First, orient yourself to the Moving Man tool by selecting the “accelerate” motion from the choose motion list. With the moving man starting at a position of -8 m, set him to “accelerate” at 1 m/s 2 from an initial velocity of 0. Observe the motion. Also notice that the tool comes equipped with a playback feature and a double-bar cursor that you may move with the mouse to probe position, velocity, and acceleration along the graph. What is his velocity when he crosses the origin (the position of 0 meters)? 4m/s 2) (0.5 pts) Below is a graph of a balls motion. Use the Moving Man Applet to reproduce the shape of this graph. Which of the following sentences gives the best interpretation of the ball’s motion? // The ball moves along a flat surface. Then it moves forward down a hill, and then finally stops. The ball doesn't move at first. Then it moves forward down a hill and finally stops. The ball is moving at constant velocity. Then it slows down and stops. The ball doesn't move at first. Then it moves backwards and then finally stops. The ball moves along a flat area, moves backwards down a hill, and then it keeps moving. Not answered 3) (1 pt) Use Moving Man to simulate the following scenario: A man starts at the origin, walks towards the tree slowly and steadily for 6 seconds, then stands still for 6 seconds,
and then turns around and walks towards the house steadily about twice as fast for 6 seconds. a) Which of the following velocity versus time graphs conveys this type of motion: A B // C D E F G H ......... Not answered b) Which of the following position versus time graphs also conveys this motion? / A B C D E F G H .......... Not answered 4) (4.5 pts total) A car is traveling along a road. Its velocity is recorded as a function of time and is shown in the graph below.
Use the Moving Man Simulation to reproduce the shape of this graph. You’ll find that there are a variety of approaches for recreating this type of motion within the applet, these include among others: • reproducing the motion using the walk motion and the velocity slider control, • reproducing the motion using the accelerate motion and acceleration slider control, or • reproducing the motion using direct mouse control over the walking man. Note: This method is hard! a) (1 pt) Describe in your own words the motion of the car and give a everyday life scenario in which the car’s velocity would resemble the plot shown above. Explain your reasoning by relating your description to what you see in the graph of the velocity vs time. The car was moving at a constant velocity. Had slowed down to a complete stop. Then started to move at an accelerating speed to get to a constant velocity. b) (0.5 pts) From this graph, what do you know about the position of the car at time equals 0 seconds? The car would be stopped c) (0.5 pts) How far does the car travel between 0 and 3 seconds? 45 meters d) (0.5 pts) The graph of the velocity of the car over this time period tells you how fast the car is going and what direction it is traveling at any time during this period. This information also tells you how the position of the car is changing during over that time period. Which of the following graphs of position versus time of the car is consistent with the velocity of the car as a function of time?
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