One definition for a "system” is, a set of things working together as parts of a mechanism or an
interconnecting network. How do you identify
systems within a Rube Goldberg Machine? How do
you know when one system ends and another
begins within the machine?

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

Ajoint produces movement when its angle decreases. which type of movement is it?

Which of the following forces require physical contact? tension air resistance friction magnetic force applied force