Answer:
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;
[tex]\eta = \dfrac{The \ out.put \ work \ Scott \ receives \ from \ the \ axe}{The \ amount \ of \ in.put \ energy \ the \ axe \ uses} \times 100[/tex]
[tex]\therefore \eta = = \dfrac{100 \ J}{200 \ J} \times 100 = 50\%[/tex]
The efficiency of the machine, η = 50%
