Image 1: Bicycle
Mechanism: Chain and Sprocket
How it works: When the pedal is pressed, the front bigger gear, the input turns. Because of the chain and sprocket, the bigger gear is connected to the smaller gear at the back. Thus, the smaller gear, the output movement, moves faster as it has less gear teeths. Thus, less effort is needed to ride the bicycle.
Image 2: Seesaw
How it works: The pivot point is the two springs in the middle, and the two seats at the end are for the effort and load. When two people sit on it, the heavier person will move downwards, making it the load. The lighter person becomes the effort and tries to move downwards.
Image 3: Musical box
How it works: When the handle at the bottom is being turned (input movement), it enables a screw-like line to move very fast. There is a gear attached to it, making the gear spin. Behind it is a smaller gear attached by a shaft. The small gear is attached go another bigger gear (To decrease the speed), and that is attached to the biggest black gear, which has dots on the body of it. When it is being turned, the pop-ups causes small strips of metal to be moved, causing music to be played.
Image 4: Window
How it works: This linkage involves two fixed points and one movable point. The fixed points are at the bottom of the photo, where it is fixed to the ide of the window, and the movable point is to enable the window to be opened and closed. This linkage at the window ensures that the window is not opened too big, to the extend that it cannot be reached to be closed.
Image 5: Wine opener
How it works: The bottom of the opener is to be put on the wine bottle. The handle at the top will be turned so that the spiral-shaped metal part will be in the bottle, opening it. The two arm-like parts at the side are used to secure the the bottle at the initial stage of opening it.As the handle moves downwards, the gears at the side moves up, cause the arm-like parts to move upwards.