Work and Energy

Flashcards covering key concepts and formulas related to work, energy, kinetic energy, potential energy, conservation of energy, power, and efficiency.

Work

When a force is applied to an object and it moves

Formula for Work

F x s, where F = force and s = distance

SI unit of work

Joule (J), which is equal to 1 Newton meter (Nm)

Imperial system unit of Work

Foot-pounds, which represents raising one pound by one foot

Energy

Energy of a body is defined as the capacity or ability of the body to do work

Law of Conservation of Energy

Energy can neither be created nor destroyed. It can only be changed from one form to another.

Kinetic Energy

Energy a body has due to its motion

Formula for Kinetic Energy

1/2 mv^2

Potential Energy

Energy an object has due to its position, shape, or condition

Potential Energy of an Object at a Height

The work done to lift an object of mass m to a height h against gravity is equal to its potential energy at that height.

Law of Conservation of Energy

Energy cannot be created or destroyed, but it can change from one form to another.

Power

How quickly work is done

SI unit of Power

Watt (W)

Efficiency

Ratio of work output to work input