Pacemaker

[Becky]

A medical device [that works] in conjunction with an [individuals] forward whatsits to make them go faster, typically used for people who are experiencing a life-threatening loss of [momentum] (going too slow).

[Sonia]

An artificial device for stimulating the heart muscle and regulating its contractions.

[Magaret]

the person or animal that establishes the speed in a race, or a person or organization that is an example for others by being successful