D D 4 l Canadian English 79% Thu Oct 9 8:56 AM Q. BE Adobe Reader File Edit View

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D D 4 l Canadian English 79% Thu Oct 9 8:56 AM Q. BE Adobe Reader File Edit View Window Help 4.pdf 130% Fill & Sign Comment Open Tools WARNING, WARNING! DANGER, DANGER! ny question on this assignment that does not include a free body diagram will not be marked, whether the question explicitly asked for a free body diagram or not. Free body diagrams are so important you should always draw them without being reminded to 1. Open the Forces in 1D simulation on moodle. Play around with it until you are comfortable with the interface. In particular, note that there are four ways to make the person in the simulation push on the object: click and drag the object, set the force slider that runs up the left side of the graph, click and drag on the free body diagram at the upper right hand corner of the simulation, entering a value for the force in the text box at the far left of the simulation. The last method only works when the simulation is paused (a) Clear the simulation so that there is nothing on the force graph. Select any of the objects, but the filing cabinet will probably work best. Apply a small force to the right. Slowly increase the applied force until the cabinet starts to slide. Keep pushing with a constant force for a little while after it starts sliding, then stop applying a force and watch until the object comes to rest. This is probably easiest to do by clicking and dragging on the object or on the free body diagram. Sketch the force vs. time diagram that results. Indicate on the sketched graph the times when the object started sliding and the time when you stopped applying a force. Be sure to show all of the forces on your sketch of the graph (b) Something very important, and possibly unexpected, happens on the force vs. time graph at the instant when the object starts to slide. What is it? Explain why it happens c) Can you arrange for the object to slide with a constant speed? If so, how can you do it? If not, why not (d) Can you arrange for the applied force and the frictional force to point in the same direction? If not, explain why it is impossible. If so then explain a way to do it 2. You are riding in a very high speed elevator. The elevator has no windows, so you cannot see the outside at all Also, it moves very smoothly so it is often difficult to tell whether it is moving at all. However, you have brought along a well calibrated spring scale and a 500 g mass a Suppose you hang the mass from the scale and the scale measures 400 g. Draw a free body diagram for the

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