Final answer:
The simple machines that help the listed devices do work are: inclined plane, lever, wedge, wheel and axle, and gear.
Step-by-step explanation:
The simple machine that helps the roller coaster, hill, and ramp do work is the inclined plane. An inclined plane is a flat surface with one end higher than the other, which allows objects to be moved from a lower elevation to a higher elevation with less force. The simple machine that helps the rake, stapler, baseball bat, and spatula do work is the lever. A lever is a plank or rigid bar that pivots on a fixed point, called a fulcrum, and can be used to lift or move objects with less force. The simple machine that helps the knife, chisel, and tooth do work is the wedge. A wedge is a triangular-shaped simple machine that can be used to split, cut, or secure objects by applying force along its sloping sides.
The simple machine that helps the rolling pin, egg beater, propeller, and door knob do work is the wheel and axle. The wheel and axle is a simple machine consisting of a wheel attached to a rod (axle), and it can be used to transmit or convert rotational motion into linear motion. The simple machine that helps the drill and swivel stool do work is the gear. Gears are toothed wheels that engage with each other and can be used to increase or decrease rotational speed and transmit power.