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Woodlands International College Physical Science Practical Investigation: Friction Completed by

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Woodlands International College
Physical Science Practical Investigation: Friction
Completed by James Jenkinson Grade 11I
Task completed on the 11th of May 2014

Table of Contents

1. Research Proposal Page:
1.1) Aim 3
1.2) Hypothesis 3

2. Scientific Investigative Report
2.1) Aim 3
2.2) Apparatus 3
2.3) Calculating Coefficients of friction 4
2.4) Calculations of different forces that will affect friction 4
2.5) Variables 5
2.6) Method 6
2.7) Results 7-11
2.8) Sources of experimental error 11
2.9) Discussion 12
2.10) Validity of experiment design 13
2.11) Conclusion 13
2.12) References 14
2.13) Photos 15

1. Research Proposal

1.1) Aim: To …show more content…

FN = 4.116N

Fg= m×g = 420g (mass of block) ÷1000 = 0.42Kg × 9.8 = 4.116N

2) Inclined surface with an angle of 45o

FN

Fgy Fg 45o Fgx Fg = m×g FN-Fgy=0 Fgx= FgsinO = 0.42×9.8 FN=Fgy Fgx= (4.116) sin (45) = 4.116N FN=FgcosO Fgx= 2.910451511N FN=(4.116)cos(45) FN= 2.910451511N

2.5) Variables:

1) Control Variables:
a) The coefficients of friction for this experiment were controlled by using the internet to find separate coefficients for the surfaces and objects used. A surface coefficient and the object coefficient were then added together and the answer was divided by two in order to find a final average coefficient.
b) The mass of the block was controlled using a spring balance hanging from a door knob.

2) Independent variable
a) The applied force is the independent variable as it is constantly changing and the final applied force is never the same for all surface types.
3) Dependent Variables
a) The dependent variables are the static and kinetic frictional force values as they are dependent on what the final applied force value will be.

2.6) Method
1) Place the block of wood onto one

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