Q 01/05

How many classical simple machines did Renaissance scientists define?

A) Six

B) Four

C) Five

D) Eight

Answer · why

A) Six

The list is the lever, wheel and axle, pulley, inclined plane, wedge and screw.

Q 02/05

Which of these is NOT one of the six classical simple machines?

A) Wedge

B) Gear

C) Screw

D) Lever

Answer · why

B) Gear

Gears are combinations of wheels; later engineers such as Franz Reuleaux catalogued hundreds of such "machine elements".

Q 03/05

The ratio of a machine's output force to the force applied is called what?

A) Torque ratio

B) Efficiency

C) Mechanical advantage

D) Leverage factor

Answer · why

C) Mechanical advantage

Ignoring friction, the work done on the load equals the work done by the applied force.

Q 04/05

A bicycle, which combines wheels, levers and pulleys, is an example of what?

A) A perpetual machine

B) An ideal machine

C) A prime mover

D) A compound machine

Answer · why

D) A compound machine

Simple machines are the building blocks from which more complicated machines are built.

Q 05/05

A machine built from several simple machines multiplies force by what, relative to its parts?

A) The product of their ratios

B) The sum of their ratios

C) The average of their ratios

D) The largest single ratio

Answer · why

A) The product of their ratios

Two machines that each double force, chained together, quadruple it.