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

Question

• Use a stiffer lever to reduce energy lost bending the lever.
• Have more than one person help to lift the lever.
• Use it with a lighter load to make it easier.
• Make a longer lever that will require less force.

Answer 1

Use a longer lever that will require less force.

Answer 2

What is the efficiency of a ramp if 2,000 joules of energy results in 1,200 joules of work? (1 point)
• 24%
• 32%
• 60%
• 80%

Answer 3

The efficiency of a ramp can be calculated by dividing the work output by the energy input and then multiplying by 100.

Efficiency = (Work output / Energy input) x 100
Efficiency = (1200 / 2000) x 100
Efficiency = 0.6 x 100
Efficiency = 60%

Therefore, the efficiency of the ramp in this scenario is 60%.

The correct option is:
• 60%