1 / 13

What is ENERGY??

What is ENERGY??. Need out a piece of paper and pencil or pen to take notes. NO DEVICES. Energy. Energy is the ability to do work. Whenever work is done, energy is transformed or transferred from one object to another object. Ex. Using a hammer to put a nail in a piece of wood.

margaret-william
Download Presentation

What is ENERGY??

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. What is ENERGY?? Need out a piece of paper and pencil or pen to take notes. NO DEVICES

  2. Energy Energy is the ability to do work. Whenever work is done, energy is transformed or transferred from one object to another object. Ex. Using a hammer to put a nail in a piece of wood.

  3. Potential Energy Potential Energy is the energy an object has because of its position or shape. Any object that can be stretched or compressed has potential energy called elastic potential energy. EXAMPLES???

  4. Calculating Potential Energy PE = mass x free-fall acceleration x height PE = mgh Units of Potential Energy = joules (J)

  5. Example Mass = 65kg Height = 35m Free-fall acceleration= 9.8 m/s2 What is this objects potential energy? PE= 65kg x 9.8m/s2 x 35m =22,000 J

  6. Kinetic Energy Kinetic energy is the energy an object has because it is MOVING. Example: When an apple is hanging from a tree brand it has potential energy but when the apple falls toward the ground it now has kinetic energy because it is MOVING.

  7. Kinetic energy of an object depends on both the object’s mass and its speed. Example: A bowling ball does more work than a tennis ball when they are moving the same speed. WHY??? IT HAS MORE MASS!!!!

  8. Calculating Kinetic Energy KE = ½ x mass x speed squared In the equation, speed is squared so even a small change in speed will cause a large change in Kinetic Energy.

  9. Example What is a snowboarder’s kinetic energy if her mass in 50kg and she is going at a speed of 4 m/s? KE = ½ x 50kg x KE = ½ x 50kg x 16 KE = 400 J

  10. Kinetic Energy Atoms and molecules are always moving so they have kinetic energy. The faster the particles in a substance are moving, the higher its temperature. This is because temperature is a measure of the average kinetic energy of the particles in a substance.

  11. Mechanical Energy Mechanical energy is the amount of work something can do because of its kinetic and potential energies. ME = kinetic energy + potential energy An objects mechanical energy can be all kinetic energy, all potential energy, or some of both.

  12. An object’s mechanical energy remains the same as long as no energy is added. • If an object’s potential energy increases then it’s kinetic energy much decrease. • If an object’s potential energy decreases then it’s kinetic energy must increase

  13. Nonmechanical Energy Nonmechanical energy- forms other than mechanical energy Such as: Chemical energy Nuclear Energy Electrical Energy Light Energy

More Related