Machines

Ch 3 - Physics

Load

The resistive or opposing force to be overcome by the machine

Effort

The force applied on a machine to overcome the load

Mechanical advantage

The ratio of the load to the effort.

Velocity Ratio

The ratio of the velocity of effort to the velocity of load

Velocity ratio

The ratio of the displacement of effort to the displacement of load.

work input

The work done on the machine by the effort i

Work output

The work done by the machine on the load

Efficiency

It is the ratio of the work done on the load by the machine to the work done on the machine by the effort.

Efficiency

Ratio of work output to work input.

Lever

It is a straight or bent bar which is capable of turning about a fixed axis.

Class 1 lever

Fulcrum is located between the effort and the load.

Class 2 lever

Load is between effort and fulcrum

Class 3

Effort is between load and fulcrum