Question

The input force of 11 N acting on the effort arm of a lever moves 0.4 m, which lifts a 40 N weight resting on the resistance arm a distance of 0.1 m.What is the efficiency of the machine

Answer 1

90.9%

Explanation:

Given:

Input force = 11 N

Distance 1 = 0.4 m

Weight = 40 N

Distance 2 = 0.1 m

We calculate the work in each case to then calculate the efficiency of the machine, just like this:

`\begin{gathered} W_1=11\cdot0.4=4.4\text{ J} \\ W_2=40\cdot0.1=4\text{ J} \\ \text{ Therefore:} \\ e=(W_2)/(W_1)\cdot100 \\ e=(4)/(4.4)\cdot100 \\ e=90.9\% \end{gathered}`

The efficiency of the machine is 90.9%