voice coil a dc motor a linear actuator a moving magnet actuator a piezoelectric actuator an electroactive polymer eap a resistive actuator e g a brake a pneumatic actuator etc as will be discussed in greater detail passive actuators such as brakes output a resistance to inhibit motion of the throttle interface rather than outputting an active force on the throttle interface independently of the input as with active actuators in some embodiments the actuator 50 can include more than one actuator referring to fig2 in another embodiment a device 100 includes a throttle interface 200 a sensor 300 an actuator assembly 500 and a processor or controller 400 the actuator assembly 500 includes a brake element 510 that has a friction surface 511 and a brake element 520 that has a friction surface 521 the friction surfaces 511 521 can be for example metal coated or uncoated asbestos or other fibrous material and or a bushing material e g sintered bronze and or hard plastic the friction surfaces 511 521 need not include the same materials a film or coating not shown a lubricant or other fluid can be disposed between the friction surfaces 511 521 e g lubricating oil or grease or dry film lubrication including mineral oil natural or synthetic lubricants molybdenum disulfide ptfe graphite etc to enhance or control friction mechanical wear or other desired properties the brake element 520 is coupled to the throttle interface 200 the friction surface 511 associated with the brake element 510 is positioned opposite the friction surface 521 associated with the brake element 520 the brake element 510 is configured to move relative to the brake element 520 for example the brake element.