Physics Ch 6

Work

The product of the magnitude of the displacement times the component of the force parallel to the displacement.

(Mechanical) Energy

The ability to do work

Work Energy Principle

The net work done on an object is equal to the change in the object’s kinetic energy

Potential Energy

Energy based on the position or configuration of an objects relative to the surroundings

Gravitational Potential Energy

Potential Energy due to the gravitational pull on a object

Conservative Force

forces for which the work done does not depend on the path taken but the initial and final positions

Non-conservative Forces

Forces where work done does depend on the path taken

Principle of Conservation of Mechanical Energy

If only conservative forces are acting the total mechanical energy of system is constant or conserved

Law Conservation of Energy

The total energy is neither increased or decreased in any process. Energy can be transformed from one form to another, Transformed from one object to another, transferred from one object to another but the total amount remains constant

Dissipative Forces

Frictional force that reduces the total mechanical energy, but not the total energy

Power

rate at which work is done

Efficiency

the ratio of useful power output to the power input