Investigating Force and Motion

 

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Abstract

Theoretical Backdrop

Experimental Design

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Method

Experimental Data

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Experimental Data

Table 2b: Force of Static and Kinetic Friction On Flat Surfaces
- Newton's Second Law of Motion

Type of Surface Angle of Incline Stopping Dist of Car Force of Static Friction Force at Which Car Begins to Move Force of Kinetic Friction Coeff of Static Friction Coeff of Kinetic Friction
Wood 10 deg 25 cm 10 gm 14 gm 4 gm 0.4 0.16
15 deg 120 cm 2 gm 4 gm 2 gm 0.08 0.08
20 deg 122 cm 1 gm 2 gm 1 gm 0.04 0.04
Sand paper grain #100 10 deg 8.8 cm 15 gm 22 gm 6 gm 0.64 0.24
15 deg 28 cm 20 gm 30 gm 10 gm 0.8 0.4
20 deg 33 cm 16 gm 30 gm 14 gm 0.64 0.56
Sand paper grain #150 10 deg 2.8 cm 20 gm 30 gm 10 gm 0.8 0.4
15 deg 14.5 cm 20 gm 30 gm 10 gm 0.8 0.4
20 deg 16 cm 16 gm 20 gm 4 gm 0.64 0.16
Aluminum Foil 10 deg 23 cm 6 gm 8 gm 2 gm 0.24 0.08
15 deg 120 cm 2 gm 4 gm 2 gm 0.08 0.08
20 deg 121 cm 1 gm 2 gm 1 gm 0.04 0.04
Butter paper 10 deg 25 cm 6 gm 8 gm 2 gm 0.24 0.08
15 deg 120 cm 2 gm 4 gm 2 gm 0.08 0.08
20 deg 122 cm 1 gm 2 gm 1 gm 0.04 0.04
Bubble wrap 10 deg 1.8 cm 35 gm 50 gm 15 gm 1.4 0.6
15 deg 2.8 cm 30 gm 48 gm 18 gm 1.2 0.72
20 deg 5 cm 30 gm 45 gm 15 gm 1.2 0.6

Calculations

Coefficient of Static Friction: ms =Fs/Ns Where:
Fs = Force of Static friction in gm
Ns = mass of car (normal force)  

Force of Kinetic Friction:
Force at which Car begins to move – Force at which car does not move   

Coefficient of Kinetic Friction: mk=Fk/Ns Where:
Fk = Force of kinetic friction in gm
Ns = mass of car (normal force in gm)

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