Mechanical Systems: Further Practice

Inclined planes, wheel and axle, lever classes, power, and the wedge.

8 questions, free, marked as you go with a worked explanation on every one.

What this covers

A ramp is 6 m long and rises 1.5 m in height. Ignoring friction, what is its ideal mechanical advantage?
A wheel and axle system has a wheel radius of 20 cm and an axle radius of 4 cm. What is its mechanical advantage?
A pair of scissors has its fulcrum, the pivot pin, between the effort (your hand) and the load (the paper being cut). Which class of lever is this?
A pulley system has 3 supporting ropes and lifts a 300 N load. Ignoring friction, what effort force is needed, in newtons?
A gear train has a driver gear with 12 teeth turning a driven gear with 36 teeth. What happens to the driven gear's speed compared to the driver's?
A motor does 900 J of work in 3 seconds. What is its power output, in watts?
Use the table below, showing the time three different motors each took to do the same 600 J of work. Which motor is the most powerful?
A wedge is used to split a log. Which two simple machines is a wedge most like a combination of?