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Physics Friction Lab - Lab Report

Lab Report
Course

physician assistantship (PAS122)

3 Documents
Students shared 3 documents in this course
Academic year: 2022/2023
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Central University Ghana

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DETERMINATION OF COEFFICIENTS OF STATIC AND KINETIC FRICTION

Partners: Sasha Ford. Student

Awine Sunday. Student,

Lab 06

Due: October 02, 2023

ABSTRACT

Two experiments were conducted to determine the static and kinetic coefficients of friction

between Cork, Felt and Plastic. The static coefficient was measured using a level track and a

pulley, while the kinetic coefficient was measured for different surface areas with varying angles.

Data was recorded during the experiment.

INTRODUCTION

This experiment aims to study friction by measuring static and kinetic friction forces using two

methods. Friction forces are non-conservative and depend on material nature, roughness, and

normal force. The friction coefficient calculated using the equation fk = μk N, fk is proportional

to the normal force. Results should show larger friction coefficients on rough surfaces and

smaller coefficients on smooth ones.

THEORY

Static friction is a frictional force that resists force applied to an object, preventing it from

moving unless the force is overcome. The coefficient of friction is μs, and the equation for static

friction is , where Fs is the force of static friction in newtons (N), μs is the coefficient of static

friction, and Fn is the normal force in newtons (N). Kinetic friction, on the other hand, is

resistance to motion due to the object's and surface's contact, acting in the opposite direction of

motion. It is only used when the object is moving, like pushing a box across a plank. Both types

of frictional forces have their own equation. The equation of kinetic friction is

Fk ≤ μk x Fn. where Fk = force of kinetic friction in newtons (N), μk = coefficient of kinetic

friction and Fn = normal force in newtons (N).

EXPERIENMENTAL PROCEDURE: The equipment used for this experiment consisted of an

inclined plane, meter stick, friction blocks (felt, cork, plastic), a balance, mass and hanger set, timer, and

a string, weights.

A friction block was placed on the inclined plane at an angle of 0 then slowly increased to determine the

coefficient of kinetic force, this step was then repeated for the remaining two friction blocks. We then set

the inclination to 45° angle and attached the string on the friction block to the mass and hanger. 100g

were then added to a 50g mass hanger. The timer began as soon as the friction block began to move,

then stopped when the block reached the end of the inclined plane. This process was repeated 3 times for

accuracy for the other two friction blocks. The times were recorded and added to table 2. For the final

part of the lab, only the cork friction block was measured. The inclination was set to 35° but the mass

added remained at 150g. The steps used for table 2 were repeated and the time was recorded in table 3.

This lab has increased our understanding and knowledge of friction forces and friction

coefficients. It was possible to measure and compare the friction coefficients of various surfaces

and, although the measurements were not very precise, we were able to calculate the

friction coefficients for the Cork, Felt and the Plastic.

Answers to the questions

1. The coefficient of kinetic friction is usually less than the coefficient of static friction

because when an object is in motion, there are fewer points of contact between the object

and the surface it is moving on, less force is require to keep it in motion but an object at

rest is more contacted to the surface due to the formation of bonds called cold bonds

between the object and the surface in contact. More force is required to overcome or

break those bonds in order put the object in motion.

2. There were variations in the coefficient. We observed a rise in acceleration and the

kinetic friction when additional weight was put to the mass hanger. It ought to alter

because the weight's addition altered the pulley's tension. The coefficients weren't close,

and they need to vary since, as we saw before, kinetic friction varies, so must the

coefficient. Examples of material chosen for their large coefficient of friction. Rubber

which has a coefficient of friction around 1, sandpaper which also has a coefficient of

friction around 1. Examples of materials chosen for their small coefficient. Glass on

glace, ice on ice.

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Physics Friction Lab - Lab Report

Course: physician assistantship (PAS122)

3 Documents
Students shared 3 documents in this course

University: Central University Ghana

Was this document helpful?
DETERMINATION OF COEFFICIENTS OF STATIC AND KINETIC FRICTION
Partners: Sasha Ford. Student
Awine Sunday. Student,
Lab 06
Due: October 02, 2023

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