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Preliminary Problem Show all your work. (Remember to use the format, formula, substitutions, answer & units.) A 25.0 kg block is initially at rest on a horizontal surface. A horizontal force of 75.0 N is required to set the block in motion. After it is in motion, a horizontal force of 60.0 N is required to keep the block moving with constant speed. Draw the force diagram for each case and determine the coefficients of static and kinetic friction from this information. |
stops 1. Draw the force diagram for each object of interest 2. Assign an appropriate coordinate system (tut: place one axis along the direction the object moves and the second axis perpendicular to the first axis) 5n 3. If force is not lying. an axis, break it into Components and redraw the force diagram with ALL THE FORCES LYING ON THE AXES. each direction, that 4. Apply Newton's second lave is Σfy = may EF = max 5. Sut ay or ax along moves at a to zero if the object does not move. particular axis or is it constant velocity along that axis the object accelerated along a 6. Set ay рат 6 7. Solve the problem. or at to a if axis IC articular.