unit 3
Energy of objects in motion
Energy: Energy is an objects ability to do work.
Joule: This is the unit measurement for work and energy for example 15j. Work: Work can only be done to an object by a different outside force like a truck pulling a trailer with a boat on it. The formula for work is W = Ef-Ei that stands for Work=E final - Initial. There is also positive work and that is where an object moves toward where the force is being put on an object, for example pushing a car and it moving toward the direction you are pushing it. There is also negative force this is when a object moves in the opposite direction of were force is being applied, for example a person parachuting. And, there is also zero work or no work this is when an object wont more when force is applied to it for example people pushing a wall. Mechanical Energy: Its the energy of an object due to its position and motion. Kinetic energy: Its the state of motion or moment of an object at a time. Kinetic energy is also dependent on mass and velocity. And the formula for KE is KE=1 over 2 mv squared that stands for Kinetic energy = 0.5 motion * velocity squared. Potential energy: Potential energy is energy that is stored for example being on a roller coaster since you have the potential and are going to go down the ramp its just stored until you do. Gravitational potential energy: Potential energy due to the object being elevated. This energy is stored and will be used when the object leaves this position and will cause it to fall making it kinetic energy and causing it to move. The formula for finding gravitational potential energy is GPE= mgh that stands for gravitational potential energy = mass*gravity*height. Elastic potential energy: This is another type of stored energy. The factors for this is how elastic the material is, and if its stretched or compressed. The more the material is stretched or compressed then the more elastic potential energy it has. The formula for elastic potential energy is EPE= 1 over 2 kx squared that means elastic potential energy = 0.5 * kinetic * distance stretched or compressed. Conservation of energy: This is about energy and how you can never lose energy and how it can only be converted for example you fall down a hill you had potential energy but then it got transferred into kinetic as you went down and there can be a lot of other examples of this but there are way to many to list. Types of energy: There are two different types of this non-renewable and renewable. Renewable- hydro-power energy, solar energy, biomass energy, wind energy, and geothermal energy plus etc. Non-renewable- fossil fuel oil, coal, natural gas, and nuclear plus etc. Solar energy: This is an example of renewable energy this is when we use energy from the sun (solar) and then use it for electricity how we get this energy is through solar panels that sit out in the sun and get solar energy. Wind energy: This is another example of renewable energy and this is when we use wind turbines to get energy. They work since when ever you have wind blow past it makes the top of it move and then through a whole cycle after that it collects the energy. Non-renewable energy: Like fossil fuels that are burned and used for electricity. And, they cannot really be used over and over again like renewable and that is what makes them so bad. |