Question

Physics Prelab

1) Define actual and theoretical mechanical advantage, using words as well as equations.

2) Define efficiency.

3) What law of physics forbids the efficiency of an actual machine from being equal to 1? (100% efficiency)

4) Is a screw an example of a wheel and axle, lever, or inclined plane?

5) What is the efficiency of a wooden ramp (μ =0.4) at an angle of 20 degrees?

Answer 1