# Explain the relationship of potential and kinetic energy to electricity

### What is gravitational potential energy? (article) | Khan Academy

Work, Energy, and Power - Lesson 1 - Basic Terminology and Concepts The following equation is used to represent the kinetic energy (KE) of an object. solving, but also a guide to thinking about the relationship between quantities. Like work and potential energy, the standard metric unit of measurement for kinetic. What is the relationship between potential energy and kinetic energy at the Another example of PE to KE is when a chemical battery is used to power a toy, via. The electricity that fuels people's homes is supplied by potential energy turned kinetic, either in the form of an electric plant fueled by coal.

At the beginning of the roller coaster, the cars must have enough potential energy to power them for the rest of the ride. This can be done by raising the cars to a great height. Then, the increased potential energy of the cars is converted into enough kinetic energy to keep them in motion for the length of the track. This is why roller coaters usually start with a big hill. As the cars start down the first hill, potential energy is changed into kinetic energy and the cars pick up speed.

Engineers design the roller coaster to have enough energy to complete the course and to overcome the energy-draining effect of friction. A principle stating that the total energy of an isolated system remains constant regardless of changes within the system. Energy can neither be created nor destroyed. Energy is the capacity to do work. The energy of motion. Energy that is composed of both potential energy and kinetic energy. The energy of position, or stored energy.

Associated Activities Swinging Pendulum - Students predict how fast a pendulum will swing by converting potential energy into kinetic energy. They verify their predictions by measuring its speed.

Swinging Pendulum for High School Lesson Closure Restate that both potential energy and kinetic energy are forms of mechanical energy. Potential energy is the energy of position and kinetic energy is the energy of motion. A ball that you hold in your hand has potential energy, while a ball that you throw has kinetic energy.

These two forms of energy can be transformed back and forth.

## Kinetic Energy

When you drop a ball, you demonstrate an example of potential energy changing into kinetic energy. Explain that energy is an important engineering concept. Engineers need to understand the many different forms of energy so that they can design useful products. An electric pencil sharpener serves to illustrate the point. First, the designer needs to know the amount of kinetic energy the spinning blades need in order to successfully shave off the end of the pencil.

Then, the designer must choose an appropriately-powered motor to supply the necessary energy. Finally, the designer must know the electrical energy requirements of the motor in order for the motor to properly do its assigned task.

## What is gravitational potential energy?

Solicit, integrate and summarize student responses. What are examples of dangerous unsafe placement of objects?

Boulders on the edge of a cliff, dishes barely on shelves, etc. An object near the surface of the Earth has a potential energy because of its gravitational interaction with the Earth; potential energy is really not associated with a single object, it comes from an interaction between objects.

Similarly, there is an electric potential energy associated with interacting charges. For each pair of interacting charges, the potential energy is given by: To find the total electric potential energy associated with a set of charges, simply add up the energy which may be positive or negative associated with each pair of charges.

An object near the surface of the Earth experiences a nearly uniform gravitational field with a magnitude of g; its gravitational potential energy is mgh.

A charge in a uniform electric field E has an electric potential energy which is given by qEd, where d is the distance moved along or opposite to the direction of the field. If the charge moves in the same direction as the force it experiences, it is losing potential energy; if it moves opposite to the direction of the force, it is gaining potential energy. The relationship between work, kinetic energy, and potential energy, which was discussed in PY, still applies: An example Two positively-charged balls are tied together by a string.

One ball has a mass of 30 g and a charge of 1 ; the other has a mass of 40 g and a charge of 2. The distance between them is 5 cm.

The ball with the smaller charge has a mass of 30 g; the other ball has a mass of 40 g. Initially they are at rest, but when the string is cut they move apart. When they are a long way away from each other, how fast are they going?

Let's start by looking at energy. No external forces act on this system of two charges, so the energy must be conserved.

### Kinetic and Potential Energy of Motion - Lesson - TeachEngineering

By the occurrence of such changes, actual energy disappears, and is replaced by Potential or Latent Energy; which is measured by the product of a change of state into the resistance against which that change is made.

The vis viva of matter in motion, thermometric heat, radiant heat, light, chemical action, and electric currents, are forms of actual energy; amongst those of potential energy are the mechanical powers of gravitation, elasticity, chemical affinity, statical electricity, and magnetism.

The law of the Conservation of Energy is already known—viz. The object of the present paper is to investigate the law according to which all transformations of energy, between the actual and potential forms, take place.

Kelvin originally proposed the terms dynamical and statical. On a universal tendency in nature to the dissipation of mechanical energy. Philosophical Magazine Series 4. As it is most certain that Creative Power alone can either call into existence or annihilate mechanical energy, the "waste" referred to cannot be annihilation, but must be some transformation of energy.

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