1. What is energy?

2.  Energy- the ability to do work  The unit for energy is Joule (J)– just like work.

3.  Kinetic Energy- energy in motion  All moving objects have kinetic energy  Kinetic Energy = KE = mv 2 2

4.  What is the kinetic energy of a car that has a mass of 1,200 Kg and is moving at a speed of 20 m/s? KE= 1,200 x 20 x 20 ÷ 2 = _____________  What is the kinetic energy of a car that has a mass of 2,400 kg and is moving at 20 m/s? How does this kinetic energy of the car in the above example compare? KE= 2,400 x 20 x 20 ÷ 2 = _____________

5.  Potential Energy- The energy that an object has because of the position, shape, or condition of the object  Gravitational Potential Energy - energy stored as a result of position or height. ▪ GPE = weight x height

6.  What is the gravitational potential energy of a book with a weight of 13 N at a height of 1.5 m off the ground? GPE= 13 x 1.5 = _________________  What is the gravitational potential energy of a cat that weighs 40 N standing on a table that is 0.8 m above the ground? GPE = 40 x 0.8 = ___________________

7.  What is the gravitational potential energy of a diver that weights 500 N standing on a platform that is 10 m above the ground? GPE = 500 x 10 = _____________________

8.  Mechanical Energy- the total energy of motion and position of an object.  Mechanical Energy (ME) = potential energy + kinetic energy (J)(J) (J)

9.  What is the mechanical energy of a book being held in the air that has 100 J or potential energy and 50 J of kinetic energy? 100 + 50 = __________________  What is the mechanical energy of a goose standing on a rock that has 75 J of potential energy and 60 J of kinetic energy? 75 + 60 = _______________

10.  Thermal Energy- is all of the kinetic energy due to motion of the particles  Chemical Energy-The energy in a compound that changes as its atoms are rearranged  Electrical Energy- is the energy of moving electrons.

11.  Sound Energy- is caused by an object’s vibrations.  Light Energy- Produced by the vibrations of electrically charged particles.  Nuclear Energy- The energy that comes from the nucleus of an atom

12.  Friction-A force that opposes motion between two surfaces that are touching

13.  Energy cannot be created or destroyed.  Energy changes forms.