Is a pencil sharpener and open system or a closed system? Defend your answer.

A second class lever has the load located in the middle and the fulcrum and the effort on opposite ends. Examples of second class levers: a wheelbarrow, hand truck, wrench, nutcracker, and the handle to a pencil sharpener. A third class lever has the effort in the middle with the load and fulcrum on opposite ends.

answer; question (1) answer; proximity;

                      question (2); // alignment;