Question

Draw the free body diagram of the block on the inclined plane. Do this by orienting your coordinate system so that the x-direction is along the plane, and the y-direction is perpendicular to the plane. Draw your diagram from the side-view. Be sure to label all three forces acting on the block (gravity, static friction, and the normal force). Include this diagram and the derivation below in your lab report. b) Use your free body diagram to show that the force of gravity Fg can be broken up into x and y components such that Fg, x = mg sin q and Fg, y = mg cos q. c) From Newton’s 1st Law we know that if the block is stationary the net force in the x and y direction will both be zero. Also, if we consider the case where the block just starts to slide, we know that the force of static friction is at a maximum so FSmax = μSFN. Use your free body diagram and the components of the force of gravity to help you set up these two equations S Fx = _ = 0 S Fy = _ = 0 d) Show how combining these two equations results in the final expression μS = tan q. e) Place the block on the inclined plane wood-face down. While watching the angle markers on the inclined plane, tilt the incline up until the block just starts sliding. Record the value of the angle. Use the value to calculate μS using the equation above. Repeat this measurement three times and average the values to obtain your best estimate. Question 3. Was the value of μS you obtained reasonable? To support your answer, refer to the reported values here for a similar pair of materials noting that the block is wood. f) One last qualitative observation: let’s try observing the difference between static and kinetic friction. Tilt the plane until the block just starts sliding then tilt it back until the block stops moving again. Do you see that the angle to get the block to start sliding is larger than the angle to get it to stop sliding? Question 4. Why is the angle to get the block to start sliding larger than the angle to get the block to stop sliding? Referring to the graph in the figure below may help you

Draw the free body diagram of the block on the inclined plane. Do this by orienting your coordinate
system so that the x-direction is along the plane, and the y-direction is perpendicular to the plane. Draw
your diagram from the side-view. Be sure to label all three forces acting on the block (gravity, static
friction, and the normal force). Include this diagram and the derivation below in your lab report.
b) Use your free body diagram to show that the force of gravity Fg can be broken up into x and y
components such that Fg, x = mg sin q and Fg, y = mg cos q.
c) From Newton’s 1st Law we know that if the block is stationary the net force in the x and y direction will
both be zero. Also, if we consider the case where the block just starts to slide, we know that the force of
static friction is at a maximum so FSmax = μSFN. Use your free body diagram and the components of the
force of gravity to help you set up these two equations
S Fx = ___________________________________ = 0
S Fy = ___________________________________ = 0
d) Show how combining these two equations results in the final expression μS = tan q.
e) Place the block on the inclined plane wood-face down. While watching the angle markers on the inclined
plane, tilt the incline up until the block just starts sliding. Record the value of the angle. Use the value to
calculate μS using the equation above. Repeat this measurement three times and average the values to
obtain your best estimate.
Question 3. Was the value of μS you obtained reasonable? To support your answer, refer to the reported
values here for a similar pair of materials noting that the block is wood.
f) One last qualitative observation: let’s try observing the difference between static and kinetic friction. Tilt
the plane until the block just starts sliding then tilt it back until the block stops moving again. Do you see
that the angle to get the block to start sliding is larger than the angle to get it to stop sliding?
Question 4. Why is the angle to get the block to start sliding larger than the angle to get the block to stop
sliding? Referring to the graph in the figure below may help you

Added by Oswi_2518 O.

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