Movingman-1

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University of Nebraska, Lincoln *

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PHYS 223

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Physics

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Apr 3, 2024

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doc

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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)? 4 m/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. This is a velocity vs time graph, and the graph records the velocity as time passes. The magnitude of the velocity tells us the speed of the car and as well the direction the car is traveling. The graph shows a constant velocity of 15 m/s for 3 seconds, over the next 5 seconds the velocity decreases to 0. And then slowly the car begins to increase to 20 m/s. b) (0.5 pts) From this graph, what do you know about the position of the car at time equals 0 seconds? There was no information of the position of the car. We just know the car is going in a positive position. So at 0 we don’t really know where the car position is at it could be either or. c) (0.5 pts) How far does the car travel between 0 and 3 seconds? 45m
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