Understanding Energy and its Forms

1. Chapter 13 Energy and Power

2. Section 13-1 Energy is the ability to do work or cause a change. Therefore, work is the transfer of energy.

3. 10 Seconds Remaining Energy is measured in units called • Joules • Pounds • Meters • Horsepower

4. 2 Kinds of Energy • 1. Kinetic Energy • 2. Potential Energy

5. Kinetic Energy Energy that an object has because of its motion. • depends on both its mass and its velocity. • The more work you do, the more energy you transfer.

6. 10 Seconds Remaining Which of the following has kinetic energy? • A rock poised for a fall • An archer’s bow that is drawn back • A rolling bowling ball • A car waiting at a red light

7. Potential Energy • Energy that is stored and held in readiness.

8. Potential Energy • Elastic Potential Energy – The energy of stretched or compressed objects. • Example: Bow or Rubber band

9. 10 Seconds Remaining The ability to do work • Velocity • Energy • Conversion • Friction

10. Gravitational Potential Energy is energy that depends on the height of an object. • The greater the weight or the greater the height it is lifted, the greater its GPE.

11. 10 Seconds Remaining A cart at the top of a hill is released and rolls down the hill. Which of the following describes the energy of the cart just as it reaches the bottom of the hill? • The cart has no energy. • The cart has maximum kinetic energy. • The cart has maximum gravitationalpotential energy. • The cart has equal gravitational potential and kinetic energy.

12. Different Forms of Energy • 1. Mechanical Energy – Kinetic or potential energy associated with the motion or position of an object. • 2. Thermal Energy – The total energy of a substance’s particles due to their movement or vibration.

13. 3. Chemical Energy – The potential energy stored in chemical compounds. • 4. Electrical Energy – The energy of moving electric charges.

14. Electromagnetic Energy – The energy of light and other forms of radiation. • Nuclear Energy – The potential energy stored in the nucleus of an atom.

15. 10 Seconds Remaining Visible light is an example of • Chemical energy • Electrical energy • Electromagnetic energy • Nuclear energy

16. 10 Seconds Remaining Energy stored in the core of an atom is called • Electromagnetic energy • Nuclear energy • Mechanical energy • Chemical energy

17. 10 Seconds Remaining The total energy of the particles in an object is called • Mechanical energy • Thermal energy • Chemical energy • Electrical energy

18. 10 Seconds Remaining An example of something that stores chemical energy is • Lightning • A microwave • A match • light