Lab 106 - hoi PDF

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Physics Laboratory Report Lab 106-Static and Kinetic Friction Lab number and Title: Name: Najeeb Alaboura

Group ID: N/A

Date of Experiment: 10/17/2020

Date of Report Submission: 10/27/2020

Course & Section Number: Phys 102A001

Instructor’s Name: Airefetalo Sadoh

Partners’ Names: N/A

1. INTRODUCTION 1.1

OBJECTIVES 

To understand the relationship between friction force and normal force acting on an object



To measure the coefficient of static friction and kinetic friction between surfaces.



Measuring the static and kinetic frictional forces using a force sensor.

1.2

THEORETICAL BACKGROUND 

When the surface of one object slides over another surface, there is a frictional force to the surfaces applied on one another. This force is opposite to the yanking force.



There is static friction for an object at rest, which is overcome before an object can be moved.



In motion, there is kinetic friction that is different from static friction

2



For kinetic friction: fk=FK is the coefficient of kinetic



For static friction coefficient can be used with serious angle.

EXPERIMENTAL PROCEDURE (5 points) 

for the calculation, it was given by slides because of Covid.



Part I, using CAPSTONE was used to find the average and slope.

 3

Part II, Calculation were done by paper.

RESULTS

3.1

EXPERIMENTAL DATA Part I

Mass 1

Mass 2

Mass 3

Mass 4

Mass 5

Mass (kg)

0.15811 0.12819 0.09817 0.08817 0.05825

Normal force (mass * gravity) (N)

1.55

1.26

0.96

0.86

0.57

Max. Static Friction Force 3.23

2.38

1.99

1.73

1.20

Kinetic Friction Force

2.11

1.62

1.45

0.99

2.71

Part II Wool Felt

Plastic

Cork

Avg. Critical Angle

16.07

8.28

18.62

Static Friction Coefficient

0.29

0.14

0.33

Calculation

4

ANALYSIS and DISCUSSION



I noted how kinetic friction coefficients were always lower than the static friction. The heavier the mass/larger the normal force, the higher the friction coefficient.

Discussion: 

The rubber has the largest friction coefficient. From experience, this can find in household or shoes material.



Line A, the line increasing as it come closer to a friction force. Line B, when it hits friction force. Line c start to move slowly. Line D start to speed and stabilize the line. It affects static friction because it was not in motion Kinetic friction seems to be always lover than the statics friction.

 

5

CONCLUSIONS



In this lab, I learned the relationship between mass and friction. It is proportional-- the larger the mass, the larger the normal force, the larger the frictional coefficient. I also learned how static friction is the maximum friction and is separate from kinetic friction, which is smaller....