Scott needs to split a chunk of wood for the fire. There is a crack in the chunk. If he uses an axe it will use 200 Joules of energy. He receives 100 Joules of work out of the machine. A) What type of simple machine has he used?
B) What is the efficiency of the machine?

A) A wedge

B) The efficiency of the machine is 50%

Explanation:

The type of simple machine Scott used is the wedge

A) A wedge is a simple machine that consists of a long thick metal or wood stem that tapers to a thin (Relatively sharp) end. It is used for a splitting, tightening,  and lifting.

An example of a wedge is an axe

B) The efficiency of a machine is given approximately as the ratio of the work output to the work input as follows;

The amount of input energy the axe uses = 200 Joules

The amount of output work Scott receives from the axe  = 100 Joules

Therefore, the efficiency of the machine, η, is given as follows;

The efficiency of the machine, η = 50%

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.

dang that balls went far