What is an example of mechanical energy?
Objects have mechanical energy if they are in motion and/or if they are at some position relative to a zero potential energy position (for example, a brick held at a vertical position above the ground or zero height position). A moving car possesses mechanical energy due to its motion (kinetic energy).
Light energy is the only form of energy that we can actually see directly. It is formed through chemical, radiation, and mechanical means. Light energy can also be converted into other forms of energy.
- Formula: E = h f where: E = Energy of the photon (in Joules) h = Constant, actually known as Planck's constant, a really ugly number. f = frequency of the light in units of per seconds (1/seconds)
- Light travels as a wave. But unlike sound waves or water waves, it does not need any matter or material to carry its energy along. This means that light can travel through a vacuum—a completely airless space. It speeds through the vacuum of space at 186,400 miles (300,000 km) per second.
- Light energy affects water temperature, biological processes (such as the relationship between predators and prey) and plant photosynthesis and growth. Under natural conditions light is controlled by topography, cloudiness, vegetation cover, and seasonal patterns, like less daylight in the winter.
The biggest example of heat energy in our solar system is the sun itself. The sun radiates heat to warm us up on the planet earth. When the burner of a stovetop is very hot, it is a source of heat energy. Conventional ovens are sources of convection heat energy, causing the food placed into it to become hot and cook.
- A good example would be heating a tin can of water using a Bunsen burner. Initially the flame produces radiation which heats the tin can. The tin can then transfers heat to the water through conduction. The hot water then rises to the top, in the convection process.
- Light is made of tiny photons which contain lots of energy. Light is also called electromagnetic radiation when speaking of light other than visible light. Of all the forms of radiation and light on the electromagnetic spectrum, humans can only visibly see a very small amount of light.
- Examples of matter containing chemical energy include:
- coal - combustion reaction converts chemical energy into light and heat.
- wood - combustion reaction converts chemical energy into light and heat.
- petroleum - can be burned to release light and heat or changed into another form of chemical energy, such as gasoline.
Gravitational energy is the potential energy held by an object because of its high position compared to a lower position. In other words, it is energy associated with gravity or gravitational force. For example, a pen being held above a table has a higher gravitational potential than a pen sitting on the table.
- Gravitational energy is the potential energy held by an object because of its high position compared to a lower position. In other words, it is energy associated with gravity or gravitational force. For example, a pen being held above a table has a higher gravitational potential than a pen sitting on the table.
- The energy is stored until the force is removed and the object springs back to its original shape, doing work in the process. Many objects are designed specifically to store elastic potential energy, for example: The coil spring of a wind-up clock. An archer's stretched bow.
- Examples of Sound Energy. Sound energy is produced when an object vibrates. The sound vibrations cause waves of pressure that travel through a medium, such as air, water, wood or metal.
Updated: 3rd October 2019