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# Work, Power, Energy

### Physical Science chapter 14 and 15

push or pull Force
Force x distance Work
An object must do this for work to be done MOVE in the direction of the force
The rate of doing work, or work/time Power
SI Unit for Force Newton (N)
SI unit for Work Joule (J)
SI unit for Power Watt (W)
Si unit for time second (s)
SI unit for distance meter (m)
How are work and energy related it takes energy to do work
What is horsepower the power of an average strong horse, English unit of power.
What is the work done move a box 3 meters with 50 N of force 150 Nm or 150 J
What is the power required to move a box 3 m with 50 N of force if it takes 3 sec 50 J/s or 50 W
In Science, this is defined as “when a force moves an object a distance.” Work
The ability to do work or cause changes in matter Energy
The SI unit for Work and energy Joule
One of the two main types of energy: energy that is stored; Potential Energy
One of the two main types of energy: the energy of motion Kinetic Energy
When a book is dropped, it has this kind of energy. Kinetic Energy and mechanical energy
A stretched rubber band is an example of this type of potential energy. Elastic Potential Energy
The fuel used by a rocket stores energy as this. (All food and fuels store this type of potential energy.) Chemical Potential Energy
An object held up above the surface of the ground has this type of potential energy. Gravitational Potential Energy (the energy of position or height of an object above the earth's surface.)
The higher an object is above the ground... The more gravitational potential energy the object has.
Once used, these type of resources can be easily replaced. Renewable Resources
Water, wind, and sunlight are examples of this type of resource. Renewable Resources
Once used, these resources cannot be easily replaced. Uranium is one example of these. So is coal and oil. Nonrenewable Resources
Petroleum, natural gas, and coal are all this: Fossil Fuels (Nonrenewable Resources)
How are fossil fuels produced? Fossil Fuels are created from decayed materials from plants and animals acted on by heat and pressure over many millions of years.
A new fuel made from renewable organic material from plants or animals Biomass Fuels
Electricity produced by combining Hydrogen and Oxygen gases with water as the only byproduct Hydrogen Fuel Cells
Electricity produced when falling or running water turns a generator. Hydropower or Hydroelectricity
What is a disadvantage of using hydroelectric power? Hydroelectricity can disturb natural ecosystems, because dams often flood land , change water flow, and can affect fish populations. They are also expensive to build
Thermal energy from the ground (often in areas where there is volcanic activity near the surface)) harnessed for electricity or heat. Geothermal
Electricity produced when wind turns a propeller which then turns a generator. Wind power
What are the advantages of using wind power? Wind power is clean, inexpensive, renewable, and available and almost everywhere.
What are the disadvantages of using wind power? The wind must be blowing. Large wind farms produce noise, are not pleasing to look at, and may have ecological effects on birds and bats.
Electricity generated by sunlight hitting a photovoltaic cell Solar power
The form of energy caused by motion of mechanical parts (like windmills and buses) Mechanical Energy
The form of energy due to the movement of electrically charged particles Electrical Energy
The form of energy related to the movement of atoms that make up matter (more is produced as the atoms move faster) Heat or Thermal Energy
This form of energy is in the form of electromagnetic radiation (light waves, x-rays, radio waves, gamma waves...) Radiant or Energy
The form of energy that comes from the fusion or fission of the center of an atom (nucleus) Nuclear Energy
What is the fuel most often used for nuclear energy? Uranium
The form of energy created by movement of air molecules caused by vibration (loudspeakers produce this) Sound Energy
The form of energy stored in the bonds of molecules in food and fuels (like gasoline) Chemical Energy
The formula for kinetic energy KE = 1/2 m x v2 or KE = (mvv)/2
The formula for gravitational potential energy GPE = m x g x h Remember g=9.8 m/s2
According to the law of conservation of energy, what is true about the total amount of energy in the universe? The total amount of energy in the universe remains CONSTANT.
What does the Law of Conservation of energy state? Energy may change from one form to another, but the total amount of energy in the Universe never changes.
What gas produced by burning fossil fuels is thought to lead to global warming? Carbon dioxide
What is the biggest problem with our continued use of fossil fuels? Fossil fuels are a nonrenewable resource. We will eventually run out of them
The form of energy due to the attraction between two objects due to their masses and distance apart. Gravitational energy
The form of energy due to the attraction of objects made of iron, nickel, or cobalt. Magnetic energy
Almost all energy on earth comes from this source. The Sun
E=mc2 Einsteins law that says energy and mass can be converted into each other. E is energy, m is mass, and c2 is the speed of light squared
Sierra serves a volleyball with a mass of 2 kg. The ball leaves her hand with a speed of 30 m/s. What is the kinetic energy of the ball? 900 J
The potential energy of an apple is 6 J. It is sitting on a shelf that is 3 m high. What is the mass of the apple? .20kg
In a pendulum swing, where is there the greatest kinetic energy? at the bottom of the swing when it is going the fastest
In a pendulum swing, where is there the greatest potential energy at the top of the swing where it is the highest
Created by: tbrandt