![]() The friction acting on the box while it is moving is called kinetic friction. Once the box starts to slide, you must continue to exert a force to keep the object moving, or friction will slow it to a stop. In this case, the normal force is equal to the weight of the object. The normal force is defined as the perpendicular component of the force exerted by the surface. For with the inequality F S N where u is the coefficient of static friction and N is the normal force exerted by a surface on the object. The maximum static friction force is sometimes referred to as starting friction. There is a limit to the magnitude of static friction, so eventually you may be able to apply a force larger than the maximum static force, and the box will move. If you push harder, the friction force increases to match the magnitude of your push. If you apply a light horizontal push that does not move the box, the static friction force is also small and directly opposite to your push. Laboratory Static and Kinetic Friction Introduction If you try to slide a heavy box resting on the floor, you may find it difficult to get the box moving Static friction is the force that counters your force on the box. How do your values compare with each other and with the "textbook value"? If there are differences, what factors do you think might be responsible?ĭata: Laboratory 6 Part 1 Constant Total Mass Acceleration m-m Trial ( 1 2 3 4 5 Part Il Constant Mass Difference mm -1 1/m Acceleration (m/s) "Trial © 1 2 3 4 5 Also obtain g using the slope of the graph in Part II. Use the slope of the graph in Part I, together with the total mass, my to obtain the acceleration due to gravity, g. Are your results consistent with the theoretical expression that you derived for the acceleration? 6. Based on your analysis what is the relationship between total mass and the acceleration of an Atwood's machine? 5. Similarly, plot a graph of acceleration vs. Based on your analysis of the graph, what is the relationship between the mass difference and the acceleration of an Atwood's machine? NOTE When printing graphs, save the trees by selecting only the pages that you really want to print. Disconnect all sensors and choose New from the File menu. Note that for Part II, there is a column in the table for 1/my. Enter the result in the column labeled mr. For each trial, calculate the total mass in grams. Enter the result in the column labeled man 2. For each trial, calculate the difference between m, and m.
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