2) two inclined planes joined together; inclined plane wrapped around a cylinder; flat surface that slants or slopes; pulley that moves along with the weight; four-link system.
Inclined plane - flat surface that slants or slopesSlider crank - four-link systemWedge - two inclined planes joined togetherScrew - inclined plane wrapped around a cylinderMovable pulley - pulley that moves along with the weight