Unit 4 Section 1: What is Energy?

Power

. Power is the rate (energy amount per time period) at which work is done or energy converted. The scientific unit of power is the watt (W), which is equal to one joule (energy amount) per second (time period). P=W/t, measured in Watts, 1 watt=1 J/s Energy/time Ability to exert a maximum amount of force in a minimum amount of time. power is the rate of doing work. It is the amount of energy consumed per unit time. Having no direction, it is a scalar quantity. In the SI system, the unit of power is the joule per second (J/s),

System

A group of interacting, interrelated, or interdependent elements or parts that function together as a whole to accomplish a goal. A set of interacting or interdependent components, real or abstract, that form an integrated whole. An open system is able to interact with its environment. A closed system is isolated from its environment.

Energy

Ability to cause change Ability to do work or cause change Joule energy is a property of matter. It can be transferred between objects, and converted in form. It cannot be created or destroyed Energy exists in several forms such as heat, kinetic or mechanical energy, light, potential energy, and electrical energy.

Potential Energy

Energy stored due to an object's position or arrangement Energy that is stored and held in readiness

Kinetic Energy

Energy that an object has due to its motion energy that a body possesses by virtue of being in motion

Elastic Potential Energy

Potential energy stored as a result of deformation of an elastic object, such as the stretching of a spring.

Gravitational Potential Energy

potential energy that depends on the height of an object Gravitational potential energy changes into kinetic energy.

Work

using a force to move an object a distance (when both the force and the motion of the object are in the same direction measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement. W = ... SI unit‎: ‎joule‎ (J)