Tyler Lisowski and John McCauley
Lab #5: Coefficient of Friction
Abstract: The purpose of this lab was to find coefficients of friction both kinetic and
static using a wooden ramp, a wooden block, and a pulley. We found both types of
coefficients of friction in the experiment. We also discovered through testing that the
normal force did not have a significant influence on the coefficients of friction. This idea
was proven by varying the mass on the block and the amount of mass it took to make it
move down the ramp with a constant velocity.
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I.
Purpose: The purpose of this lab was to show the relationship between
static and kinetic coefficients of friction. It also was done to prove that
static coefficients of friction are always greater than kinetic coefficient of
frictions for the same object. Lastly, this lab was performed to show that
the normal force of an object has no effect on the coefficients of friction.
II.
Hypothesis: If the normal force is varied, then there will be no change in
the coefficients of Friction. Also, we hypothesized that kinetic coefficients
of friction are always smaller than static coefficients of friction
III. Materials: Smooth wooden board, smooth wooden block, string, balance
and calibrated masses, mass holder and slotted masses, pulley, and
protractor
IV.Procedure:
Part 1:
1.
Place the block face down on the wooden board and raise the board until the
block just begins to slip.
Find the angleusing trigonometry and record it as the
angle for static friction in the Data Table.
2.
Repeat step 1 for three more times having a total for different angles.
Put the
block at different spots on the wooden board and use the same side for each trial.
3.
Place the block on the wooden board and rise until the block moves with a
constant velocity after a slight push to start the block in motion. Record the angle
as the kinetic friction in the Data Table.
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 Spring '08
 Barlow
 Force, Friction, Mass, Ode

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