V. Does kinetic friction depend on area of contact? 15. Make a prediction. If the area of contact increases, does the kinetic friction increase, decrease or stay the same? Give a reason for your prediction.
V. Does kinetic friction depend on area of contact? 15. Make a prediction. If the area of contact increases, does the kinetic friction increase, decrease or stay the same? Give a reason for your prediction.
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V. Does kinetic friction depend on area of contact?
15. Make a prediction. If the area of contact increases, does the kinetic friction
increase, decrease or stay the same? Give a reason for your prediction.
16. Test the Larger Area. Two sides of the block are covered in the material
assigned to your group. Remove the masses from the end of the string and place
a 70g mass on the string. Place the larger of the two sides on the track. Repeat
the experiment as in Part I.
17. Test the Smaller Area. Place the smaller of the two sides on the track. The
height of the pulley may need adjusting so the string is horizontal with the track.
Repeat the experiment.
Area Dependence
Hanging Mass
Block Mass
Area Size
Acceleration
m
M
(kg)
(kg)
(m/s2)
Larger Area
0.070
134
0.6534
Smaller Area
0.070
.134
0.9387
18. Calculate the kinetic frictional force for each trial.
19. Does kinetic friction depend on the area of contact? If the frictional forces
calculated are within 10% error, then the kinetic friction is independent of area.
20. How well do the results agree with your prediction?
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