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Friction LAB Report

Profesor Isabela lab report
Course

 General Physics Laboratory I (PHYS 1107 )

10 Documents
Students shared 10 documents in this course
Academic year: 2021/2022
Uploaded by:
Anonymous Student
This document has been uploaded by a student, just like you, who decided to remain anonymous.
University of Houston-Downtown

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Abstract

In this week’s experiment, we learned the difference between two different but equally important frictions. Static friction and kinetic friction. To understand these two, you must first understand friction. Friction is the force that will resist motion of one surface that comes in contact with another. Our formulas included in this experiment are Fs=usN(us being the coefficient of static friction) and fk=ukN( um is the coefficient of kinetic friction ). The N is the equation formula stand for normal force. The second method requires us to measure the angle at which an object can begin sliding towards a direction and accelerating.

In our first method and part one of the experiment, we notice that from our data we have larger weight values needed in static rather than in kinetic force. It can be applied from previous and newfound knowledge that the larger weight is needed to move the block without the assistance of any additional force. The tapping aids the block in having a steady motion. In comparison of our values , we are easily able to see which function has the greater values. Our uk values was successfully found out to be 0 for method one and 0 for method two.

PHYSICS 1107 FALL 2022 CRN 22019

LAB 6. Friction

ETERNETI K. FERGUSON

PARTNERS: ELVIA CASTILLO

Date Performed: October 3

rd

, 2022

Instructors Name: Dr. I. Vrinceanu

Static and Kinetic friction

  1. Purpose : the purpose of this lab is demonstrated and observe the force of friction. Friction is the resistance that one surface or object encounters when moving over another. We can depict and distinguish between both static friction and kinetic friction.
  2. Background - Friction can be separated into two different kinds, static and kinetic. Static friction is a force that hinders the movement of an object moving along the path. Once friction has properly been applied, an object can slide across the surfa ce and then kinetic friction will act on the said object.

 Static friction coefficient calculation : Ff= μsFN (1) μs is the coefficient of static friction , Ff is force of friction, FN is normal force

 Solving coefficient of static friction μs =m2/m1 (2) Mass of the second object divided by the mass of the first  Kinetic friction calculation: Ff= μkFN (3) μk is the coefficient of kinetic friction ,Ff is the force of friction and FN is normal force

μs =tan(degree) (4)

m0 + 400g 616 g 300 g 250 g 300 g 283 g

m0 + 600g 816 g 400 g 400 g 390 g 396 g

Coefficient of static friction (slope): μs = 0.

Table2. First method: Determining the coefficient of kinetic friction

Mass of block

m1 (g)

Mass of hanger plus weights

m2 (g)

(1st trial)

Mass of hanger plus weights

m2 (g)

(2nd trial)

Mass of hanger plus weights

m2 (g)

(3rd trial)

Mass of hanger plus weights

m2 (g)

(average)

m 0 (block no

weights)

216 g 70 g 62 g 64 g 65 g

m0 + 200g 416 g 120g 115 g 115 g 116 g

m0 + 400g 616 g 180 g 170 g 170 g 173 g

m0 + 600g 816 g 220 g 220 g 220 g 220 g

Coefficient of static friction (slope): μs =_0.

Table 3. Measurement of x and y : Second method Kinetic

1 2 3 4

x (cm) 77 cm 75 cm 77 cm 76 cm

y (cm) 26 cm 28 cm 26 cm 26 cm

Coefficient μs =y/x 0 0 0 0.

Determination of μs and its uncertainty:

Average: μs =0.

Standard deviation (SD)= 0.

Uncertainty= = 0 where n=number of trials

Measurement of x and y :

1 2 3 4

x (cm) 77 cm 74 cm 75 cm 75 cm

y (cm) 34 cm 35 cm 33 cm 33 cm

Coefficient

μs=y/x

0 0 0 0.

B) Determination of μs and its uncertainty:

Average: μk =_0.

Standard deviation (SD)= 0.

Uncertainty= = 0.

*average = total /trials

*SD= enter into excel (stdev)

5. DATA CALCULATIONS AND ANALYSIS

Excel plot 1

Excel plot 2

6. CONCLUSION

This experiment required more patience than others and much consistency. Starting off, it was hard to get consistent weight and make the pulley string stay on the spinning wheel. The string repeatedly falling off the wheel without our knowledge, caused my partner and I to experience inconsistency and miscalculation with our first few data collections. Once we noticed that our pulley slipped, we obtained control of the pulley and began to successfully complete the experiment. If we didn’t catch this simple mistake when we did, the experiment could have potentially had many more points of error and mistrial. In part one we first began by barely adding small increments to the set 50 grams. We decided to start using small weight like 5 grams and 2 grams plates and worked our way up as we increased the block weight. We noticed that both methods, kinetic and static, showed consistency between the trails. The tapping that we proceeded to complete along with the kinetic friction, will allow us to put less weight for the block to begin motion. We are shown that the static force is greater than kinetic force. There is greater force needed to make the block slide than the force needed to pull it. The values weren’t expected to be the same which was proven in our lab.

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Friction LAB Report

Course:  General Physics Laboratory I (PHYS 1107 )

10 Documents
Students shared 10 documents in this course

University: University of Houston-Downtown

Was this document helpful?
C
Abstract
In this week’s experiment, we learned the difference between two different but equally important
frictions. Static friction and kinetic friction. To understand these two, you must first understand
friction . Friction is the force that will resist motion of one surface that comes in contact with
another. Our formulas included in this experiment are Fs=usN(us being the coefficient of static
friction) and fk=ukN( um is the coefficient of kinetic friction ) . The N is the equation formula
stand for normal force. The second method requires us to measure the angle at which an object can
begin sliding towards a direction and accelerating.
In our first method and part one of the experiment, we notice that from our data we have larger
weight values needed in static rather than in kinetic force. It can be applied from previous and
newfound knowledge that the larger weight is needed to move the block without the assistance of
any additional force. The tapping aids the block in having a steady motion. In comparison of our
values , we are easily able to see which function has the greater values . Our uk values was
successfully found out to be 0.2604 for method one and 0.3478 for method two.
PHYSICS 1107 FALL 2022 CRN 22019
LAB 6. Friction
ETERNETI K. FERGUSON
PARTNERS: ELVIA CASTILLO
Date Performed: October 3rd , 2022
Instructors Name: Dr. I. Vrinceanu

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