ࡱ> 574c jbjbSS 11]*******nnnn8 nA$,eYn,*,****>V****** Bnn Interactive Physics Worksheet #4 One-D Motion  Overview In One-D Motion we get quantitative about forces and accelerations for the first time. We will limit our attention to forces and motions in one dimension only. You will apply a force of adjustable magnitude to a body of adjustable mass. You will examine graphs of the position, velocity, and acceleration as functions of time and compare them to the actual motion produced by the applied force. Please punch in and punch out of the computer lab using the time card at right and write your answers to each question on the worksheet itself in the space provided. Getting Started Locate and open the Interactive Physics moduleOne-D Motionin the Physics 121 folder. When the window opens you will see a scene like that shown in Figure 1.  Fig 1: The startup screen from One-D Motion The body has amass that can be adjusted from 1 to 5 kg with the slider control on the left. It is acted on by a force that is adjustable between 10 N (downward) and +10 N (upward) using the slider on the right. You can also turn the force on or off and display a one-dimensional coordinate axis using the control buttons above the sliders The position, velocity, and acceleration of the body are graphed as functions of time on the three graphs on the right side of the screen. Begin by adjusting the force and noticing that the red force vector changes its magnitude and direction according to the value chosen on the slider. Also try turning the force on and off and notice the effect on the display of the force vector. Finally, turn on the display of the axis which runs from -30 m at the bottom of the screen to +=30m at the top. Notice that the body starts at x = 0 at t = 0. Set the force to +4.00 N and the mass of the body to 2.00 kg. Make sure the axes are displayed and the force is on. Run the simulation and notice that the body leaves small circular dots in its track every 1 second on the clock or 50 frames on the Tape Player. Let the body move off the top of the screen and then stop the simulation and answer these questions: Q1: What are the positions of the circular dots that are left at successive one second intervals? Do you see a pattern? Can you explain this pattern in terms of the equation x =  EQ \f(1,2) a t2? Q2: What does the acceleration versus time graph tell you about the acceleration of the body during this interval? Given the applied force and the mass does this make sense? Q3: What does the velocity versus time graph tell you? What does the fact that the slope of this graph is constant tell you about the rate at which the velocity is changing? How is this related to the acceleration? Q4: What does the position versus time graph tell you? What does the fact that its slope is constantly increasing mean? Now drag the frame counter at the bottom of the window back to frame 100 and note the time which should be 2.0 s. Turn the force off and click on the Run button to restart the simulation from this point. Stop it when you get past frame 200. Q5: Describe the motion and explain how it is related to the shapes of the three graphs during the interval from t = 2.0 s to t = 4.0 s. Now drag the frame counter back to frame 200, set the force to 2.00 N, turn the force back on, and click on the Run button to restart the simulation from this point. Let the simulation run past the point at which the forward motion of the body is eliminated. Then stop the simulation and drag the frame counter back to that point. Q6: How long does it take this force to bring the body to rest? How does this compare with the amount of time it took the original force to bring the body up to speed in the first place? Why the difference? Q7: What is the position of the body at the turn around point? 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