Mechanical Work

Work is done in a mechanical system when a                        _______or a torque moves an object.

The formula for work in linear mechanical systems is work = _____________________

A student runs up twenty steps, each step is one foot high.  If the student weighs 120 lbs., find the work that is done.

• 120 lb ft

• 2400 ft lb

• 1440 lb ft

• 120 ft lb

A pulley system lifts a load of 30 Newtons through a height of 0.5 meter.  The amount of work done is _______________.

The formula for calculating efficiency is work _output_______ x 100

_____________

The angular displacement used to calculate rotational work must be measured in                  .

What is the English work unit?

• Newton

• Joule

• foot-pound

• pascal

Which unit is commonly used in the SI system for work?

• foot-pound

• newton

• pound-force

• joule

How is 1 revolution typically measured?

• degrees

• newtons

• gradians

• minutes

What is the SI unit for measuring angles, equivalent to approximately 57.3 degrees?

• grad

• revolution

• radian

• degree