The wheels and gears of a machine are greased in order to decrease :

a)
friction

b)
output

c)
efficiency

d)
potential energy

In a system, when potential energy decreases, then entropy also decreases. true false

This is one type of line graph in which the independent variable is time plotted on the x axis and the dependent variable, also numerical, is plotted on the y axis.

A1-lb collar is attached to a spring and slides without friction along a circular rod in a vertical plane. the spring has an undeformed length of 5 in. and a constant k =25 lb/ft. knowing that the collar is released from being held at a determine, the speed of the collar and the normal force between the collar and the rod as the collar passes through b.