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Learning Goal: To understand the relationship between applied force, net force, acceleration, and mass for 1-dimensional motion. For this problem, use the PhET simulation Forces and Motion: Basics. This simulation allows you to push on different objects with a certain horizontal force and see the resulting motion. You can control the mass of the objectby using different objects or by stacking up to three objects on top of one another. Click and drag on the objects to move them to the desired location. You can also adjust Friction between None and Lofts by using the slider provided on the right side of the window. While the object is being pushed, you can see the directions and values of the various horizontal forces acting on it, as well as the value of the sum of these forces. In addition you can display the mass, speed, and acceleration of the object. Sur fro ccee and Motion: Bas' Start the simulation. When you click the simulation link, a new window will open. Double-click on Acceleration to get started. Adjust the Applied Force by moving the slider bar (which is at the center bottom of the main window) left or right. Release the slider to stop applying a force on the object. You can also adjust the Applied Force in increments of 50 Newtons by clicking on the left and right arrows above the slider bar. Apply a force on the crate and watch the resulting motion. Feel free to play around with the simulation, and investigate what happens when you click on either the figure or the object, while they are in motion. When you are done, hit reset (round button with a circular arrow, to the right) and set Friction to None prior to beginning Part A. Make sure that Forces, Sum of Forces, Values, Masses , Speed, and Acceleration are all selected. v PartA Choose the 200 kg refrigerator. Set the applied force to 400 N (to the right). Be sure friction is turned off. What is the net force acting on the refrigerator? The net force is zero. The magnitude of the net force is less than 400 N, directed to the right. The magnitude of the net force is 400 N, directed to the right. The magnitude of the net force is greater than 400 N, directed upward and to the right. The magnitude of the net force is greater than 400 N, directed downward and to the right