Currently, we’re learning about the inclined plane as well as different type of friction: static and kinetic friction. Whenever we do word problems in class, the situation in each problem always have something like gravity always equal to 10 m/s^2 and object start at rest (Vi = 0) and etc, which doesn’t illustrate how our real-world work. In this inclined plane and friction section, we had done a lab to experimentally determine the coefficient of static friction for multiple materials, and understand that we had made a lot of assumptions in the problems we do on the board.
So basically we just place a different object upon the wood with the different sandpaper and find out the angle of the very first moment that the object starts to slide down. After that, we will collect the data and analysis it as well as answer some question like below.
Friction Lab
1. Sandpaper 4
2. Sandpaper 5
3. Sandpaper 2
4. Sandpaper 3
5. Sandpaper 1
6. Cloth
7. Wood
All the assumption we make in the problems we do on the board are:
1. Constant velocity
2. No friction force
3. Start from rest
4. Gravity is 10 m/s^2
5. Everything is flat
These are the real-life problems we faced in the experiment:
1. We always apply some little forces when we place the object upon the surface
2. The measuring is not accurate (using our eyes)
3. We didn’t do a great job in placing the sandpapers on the wood. The surface isn’t flat, which will create more friction