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There are two types of friction, static friction and kinetic friction.Even the smoothest floors have friction but very little.If a floor had no friction then you could throw a marble and it could keep on going on and on until it crashed with another object. In Static friction you check how much force it takes to move the object.In Kinetic friction,you find the amount of friction while it is moving.If you were in a car and you were constantly accelerating,(remember,acceleration=new velocity -initial velocity time taken ) you would not have to worry about friction slowing you down. Have you ever had a floor burn. What is happening is really that the frictional force of the surface you are sliding against is reacting with your skin.
1.Find the weight of a certain weighing cube.
2.Put the cube on a wooden rectangle with the metal surface.
3.Hook the Newton scale up with the rectangle.
4.Check how much friction it takes to pull the rectangle.
5.Then check how much force it takes while it is moving.
6.Repeat steps 1-6 with the rest of the variables.
7.Add the lubricant(Oil) and see how much the required force reduces.
8.Record results in Data section.
Kinetic friction for Lead-8.0N sandpaper surface
Static friction for Lead-6.0N sandpaper surface
Kinetic friction for Iron-5.5N sandpaper surface
Static friction for Iron-5.0N sandpaper surface
Kinetic friction for Brass-6.0N sandpaper surface
Static friction for Brass-5.5N sandpaper surface
Kinetic friction for Aluminum-2.1N sandpaper surface
Static friction for Aluminum-1.9N sandpaper surface(sandpaper against cork)
Kinetic friction for Lead-5.0N wood surface
Static friction for Lead-4.8 wood surface
Kinetic friction for Iron-3 wood surface
Static friction for Iron-2.9 wood surface
Kinetic friction for Bass-3.1 wood surface
Static friction for Bass-3 wood surface
Kinetic friction for Aluminum-1.2
static friction for Aluminum- 0.9
(wood against cork)
With lubricant
Lead -2N
Brass -1.5N
Iron -4N
Aluminum -0.6N
The weight for the cubes are
Aluminum Silver-87.43g
Brass Yellow-271.09g
Lead Grey-352.25g
Iron Brown-249.85g
Kinetic friction for Lead -1 N wood surface
Static Friction for Lead - 0. 9N wood surface
Kinetic Friction for Brass -1.1 N wood surface\
Static Friction for Brass - 1 N wood surface
Kinetic Friction for Iron -0.9 N wood surface
Static Friction for Iron -0.5 N wood surface
Kinetic Friction for Aluminum-0.05 wood surface
Static Friction for Aluminum-0.01 N (wood against wood)
Kinetic Friction for Lead 3.5 N sandpaper surface
Static Friction for Lead-2 N sandpaper surface
Kinetic Friction for Brass-2.1 N sandpaper surface
Static Friction for Brass- 1.9 N sandpaper surface
Kinetic Friction for Iron-1.8N sandpaper surface
Static Friction for Iron-0.9N sandpaper surface
Kinetic Friction for Aluminum-0.5N sandpaper surface
Static Friction for Aluminum-0.5N sandpaper surface(sandpaper against wood)
35.6cm wooden plank,Wooden rectangles with different surfaces. Olive Oil(Lubricant) and 4 different weighing cubes (Brass yellow,Aluminum white,Iron brown and Lead grey).
The Manipulated variable is the kind of metal cubes. The dependent variable is the lubricant.
Data continued
Kinetic friction for Lead-8.0N sandpaper surface
Static friction for Lead-6.0N sandpaper surface
Kinetic friction for Iron-5.5N sandpaper surface
Static friction for Iron-5.0N sandpaper surface
Kinetic friction for Brass-6.0N sandpaper surface
Static friction for Brass-5.5N sandpaper surface
Kinetic friction for Aluminum-2.1N sandpaper surface
Static friction for Aluminum-1.9N sandpaper surface(sandpaper against cork)
Kinetic friction for Lead-5.0N wood surface
Static friction for Lead-4.8 wood surface
Kinetic friction for Iron-3 wood surface
Static friction for Iron-2.9 wood surface
Kinetic friction for Bass-3.1 wood surface
Static friction for Bass-3 wood surface
Kinetic friction for Aluminum-1.2
static friction for Aluminum- 0.9
(wood against cork)
With lubricant
Lead -2N
Brass -1.5N
Iron -4N
Aluminum -0.6N
Kinetic friction for Lead-2.7 N metal surface
Static friction for Lead-2.1 N metal surface
Kinetic friction for Iron-1.9 N metal surface
Static friction for Iron-1.8 N metal surface
Kinetic friction for Brass-1.9N metal surface
Static friction for Brass-1.5N metal surface
Kinetic friction for Aluminum-0.5N metal surface
Static friction for Aluminum-0.3N metal surface(metal against wood)
Kinetic friction for Lead-6.0N metal surface
Static friction for Lead-3.0N metal surface
Kinetic friction for Iron-4.0N metal surface
Static friction for Iron-3.9N metal surface
Kinetic friction for Brass-4.5N metal surface
Static friction for Brass-3.9N metal surface
Kinetic friction for Aluminum-1.4N metal surface
Static friction for Aluminum-1.3N metal surface(metal against cork)
In summary,we conclude that there are two main ways to reducing friction.1.)Using a smoother surface against itself,2.)Adding a lubricant, almond oil. According to all of our data it depends on the weight of the manipulated variable on how much friction it causes against the independent variable.