Physics - Work, Energy and Power

Flashcards covering key concepts related to work, energy, and power in physics.

Work

Work is said to be done when a force acts on an object and moves it through some distance.

Formula for Work

W = F imes d, where W is work, F is force, and d is distance.

SI Unit of Work

The SI unit of work is Joule (J).

One Joule

One joule is the work done when a force of one newton moves an object through one meter.

Kinetic Energy

The kinetic energy of a body is the energy that a body possesses by virtue of its motion.

Formula for Kinetic Energy

K.E. = \frac{1}{2} mv^2, where m is mass and v is velocity.

Potential Energy

Potential energy is the energy possessed by a body due to its position or deformation.

Formula for Potential Energy

P.E. = mgh, where m is mass, g is acceleration due to gravity, and h is height.

Forms of Energy

Different forms of energy include electrical energy, chemical energy, nuclear energy, heat energy, and light energy.

Efficiency

Efficiency is the ratio of useful output energy to total input energy, often expressed as a percentage.

Law of Conservation of Energy

Energy cannot be created or destroyed, only transformed from one form to another.

Renewable Energy Sources

Energy sources that are replenished naturally, such as solar, wind, and hydroelectric energy.

Non-Renewable Energy Sources

Energy sources that are depleting and not easily replenished, such as fossil fuels and nuclear energy.

Power

Power is the rate of doing work, calculated as work done over time.

SI Unit of Power

The SI unit of power is Watt (W), equivalent to one joule per second.

Nuclear Energy

Energy released in the form of heat when an atomic nucleus breaks, associated with processes like nuclear fission.