An example of intentionally increasing friction?

In physics the desire of an object to keep doing what it is doing is termed?

Acaterpillar tries to climb straight up a wall a meter high, but for every 2 cm up it climbs, it slides down 1 cm. eventually, it reaches the top. when it reaches the top, it does not pull itself over so it will slide down 1 cm. what is the total displacement traveled?

In a series circuit the __ is the same at every point