Question

A lever has a mechanical advantage of 5. How large would a force need to be to lift a rock with a mass of 100kg

Answer 1

196 Newton force is needed to lift a rock.

Step-by-step explanation:

We know a formula, Mechanical advantage × effort applied = Load lifted. In this question, mechanical advantage of lever = 5 Load lifted = Mass of the rock × acceleration due to gravity = 100 × 9.8 = 980N so, putting the given values in the formula,
`\text { Force }=\frac{\text { Load lifted }}{\text { Mechanical advantage }} \text { Force }=(980)/(5)=196 \text { Newton. }` Therefore a force of 196 Newton is required to lift a rock of 100 kg with mechanical advantage 5.