Inside the printer, there are rolers. As the printer activated,the rolers start to roll so that the paper can go in and come out .This roler is connected with the thick round part which enables the roler to roll. So the roler is wheel and axle.

homework #1

OK, since i am late i'll just give a simple tool: a knife. the knife is classified as a inclined plane as the sides are sloped to create a wedge which we can use to cut with. the smaller the angle of the inclined plane, the sharper it is.