A complex machine is used typically for moving rock, mulch, compost, and other various things to a garden. There are 2 simple machines in a wheelbarrow a lever and a wheel and axel.
Newton's Three Laws
Signifies a peak level of performance that uses the least amount of inputs to achieve the highest amount of output. It minimizes the waste of resources such as physical material, energy, and time while accomplishing the desired output. Equation- the ratio of useful output to total input or r=P/C where P= the amount of useful output (product) produced per the amount C (cost) of resources consumed.