Question

A certain lever system is only 30% efficient. What could make it more efficient? (1 point)
Responses

Use it with a lighter load to make it easier.
Use it with a lighter load to make it easier.

Use a stiffer lever to reduce energy lost bending the lever.
Use a stiffer lever to reduce energy lost bending the lever.

Have more than one person help to lift the lever.
Have more than one person help to lift the lever.

Make a longer lever that will require less force.

Answer 1

Use a stiffer lever to reduce energy lost bending the lever.

Rationale: Efficiency is lowered by energy lost to deformation (bending) and friction. Making the lever stiffer reduces bending losses (and improving the fulcrum to reduce friction helps too), increasing efficiency.