PHYS 2425- LAB_Friction_Phet 2 exam-with verified answers-2022
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Name: ____________________________________ Table: _____________ Section: __________ Lab 4: PhET Simulation – Friction PhET simulations are simulations on all sorts of topics (not just physics) tha ... t come from the University of Colorado - Boulder To find the simulation, either Google “Phet simulation ramp forces and motion” or go directly to this link: http://phet.colorado.edu/en/simulation/ramp-forces-and-motion Click “Run Now.” When the simulation opens: • Click on the “Force Graphs” tab at the top. • Set the ramp angle to zero degrees. • Check the check boxes for the applied force and the force of friction at the bottom left. We are going to examine the way friction behaves when you push an object on a flat surface. You can make the wooden stick-figure doll apply a force to the crate by clicking on the crate and dragging it along, or just slide the “Applied Force “ slider up or down. Introduction: Starting with the crate stationary, slowly increase the applied force on the crate without having the crate move quite yet. What is the acceleration? How does the frictional force compare to the applied force? Acceleration when velocity changes, the rate of change. Frictional force is equal to the applied force but its acting the opposite direction. Do Fapplied and Ffriction (labeled Fa and Ff) constitute a Newton’s third law pair? Why or why not? No they do not constitute to Newtons third law pair because its not an action reaction. Clear the scenario using the button at the bottom and now gradually increase the applied force until the block starts to move. At approximately what value of applied force does the block begin to move? At 493 Newtons Describe in words what happens to the frictional force the instant the block begins moving. (Use specific evidence from the free-body diagram and/or the graph provided by the simulation.) The frictional force is pushing back instantly on the box. As the applied force pushes forward the frictional force pushes back. CONTINUED.... [Show More]
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