A worm gear is a type of gear that has teeth cut on the inside of a cylinder. It meshes with a worm, which is a screw-shaped gear.

A key in a shaft-hub connection serves all of the following purposes: to transmit torque, to prevent relative rotation, and to prevent axial movement.

A ball bearing is a type of bearing that uses rolling elements (balls) to reduce friction.

A flywheel in a machine serves all of the following purposes: to store energy, to reduce speed fluctuations, and to improve efficiency.

A flat follower is a type of cam follower that has a flat surface that follows the cam.

A spring in a machine serves all of the following purposes: to store energy, to absorb shock, and to provide a force.

A universal joint is a type of joint that allows for relative rotation between two members.

A clutch in a machine serves all of the following purposes: to connect and disconnect two shafts, to change the speed of a shaft, and to transmit torque.

All of the options are types of brakes that use friction to stop or slow down a machine.

A gearbox in a machine serves all of the following purposes: to change the speed of a shaft, to change the direction of rotation of a shaft, and to increase the torque of a shaft.

All of the options are types of materials that are often used for gears.

A lubricant in a machine serves all of the following purposes: to reduce friction, to prevent wear, and to cool the machine.

All of the options are types of failures that can occur in a machine component.

A safety factor in machine design serves all of the following purposes: to account for uncertainties in the design, to prevent failure of the machine, and to ensure that the machine operates safely.

All of the options are types of analyses that are used to determine the stresses in a machine component.