The normal force has a smaller magnitude than the weight.Ĭorrect If you were actually going to solve this problem rather than just draw the free-body diagram, you would need to define the coordinate system. The normal force is upward, the weight is downward, and the pushing force is horizontal. The normal force and weight have the same magnitude. The normal force has a greater magnitude than the weight. The normal force and weight are both downward and the pushing force is horizontal. Determine the directions and relative magnitudes of the forces Which of the following statements best describes the correct directions and relative magnitudes of the forces involved?ĪNSWER: The normal force and weight are both upward and the pushing force is horizontal. Part C Select the choice that best matches the free-body diagram you have drawn for the piano. To maximize your learning, you should draw the diagram yourself before looking at the choices in the next part.
You won't have the exact value of all of the forces until you finish solving the problem. Draw the length of your vectors to represent the relative magnitudes of the forces, but you don't need to worry about the exact scale. Now that you have identified the forces acting on the piano, you should draw the free-body diagram. ANSWER: acceleration of the piano gravitational force acting on the piano (piano's weight) speed of the piano gravitational force acting on Chadwick (Chadwick's weight) force of the floor on the piano (normal force) force of the piano on the floor force of Chadwick on the piano force of the piano pushing on Chadwick From the list below, select the forces that act on the piano. Part B Identify the forces acting on the object of interest. For this situation you should draw a free-body diagram for
#Mastering physics body diagrams how to#
How to approach the problem You should first think about the question you are trying to answer: What is the acceleration of the piano? The object of interest in this situation will be the object whose acceleration you are asked to find.ĪNSWER: the floor. Part A Determine the object of interest for the situation described in the problem introduction. If Chadwick applies a horizontal force to the piano, what is the piano's acceleration? To solve this problem you should start by drawing a free-body diagram. The piano can slide across the floor without friction. Suppose that you are asked to solve the following problem: Chadwick is pushing a piano across a level floor (see the figure). In this problem you will only draw the free-body diagram. Then you will need to divide the forces into x and y components, sum the x and y forces, and apply Newton's first or second law. Always make the object of interest the origin of your coordinate system.
In most problems, after you have drawn the free-body diagrams, you will explicitly label your coordinate axes and directions. When possible, the length of the force vectors you draw should represent the relative magnitudes of the forces acting on the object. Draw the vectors for each force acting on your object of interest. Also, do not include quantities, such as velocities and accelerations, that are not forces. Do not include forces acting on other objects in the problem. Identify all the forces acting on the object and their directions. It is customary to represent the object of interest as a point in your diagram. To draw a free-body diagram use the following steps: 1.
To learn more, read your instructor's Grading Policyįree-Body Diagrams Learning Goal: To gain practice drawing free-body diagrams Whenever you face a problem involving forces, always start with a free-body diagram. HOMEWORK3 Due: 11:00pm on Sunday, NovemNote: You will receive no credit for late submissions.
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