1. Grab the Girl on a Bike Picture
Where ever you have room make the following chart
Form of Energy
From
Transferred/ transformed to
Work or change it caused

3. Critical Question: What is the difference between potential and kinetic energy

4. Overview
Work, Power, Energy Notes

5. ENERGY WORK POWER MECHANICAL ENERGY POTENTIAL ENERGY KINETIC ENERGY
CONSERVATION OF ENERGY
MACHINES
EFFICIENCY
ENERGY FOR LIFE

6. ENERGY
The property of an object or a system that enables it to do work.
Measured in joules (J)

7. ENERGY Only the effects of energy are seen.
Energy transferred from one place to another.

8. WORK The application of a FORCE.
The MOVEMENT of something by that FORCE.
Force x distance = WORK

9. W = F x d WORK DONE AGAINST ANOTHER FORCE
Archer stretches bowstring against elastic forces of the bow.

10. W = F x d WORK DONE TO CHANGE A SPEED OF AN OBJECT
Acceleration or stopping a car.

11. WORK THE MEASUREMENT
The Joule is a N x m
1 joule of work is done when the force of 1 N is exerted of a distance of 1 meter

12. POWER The rate at which work is done. Power = 𝑤𝑜𝑟𝑘 (𝐽) 𝑡𝑖𝑚𝑒 (𝑠)
Watt (W) is a joule per second

13. POWER PROBLEM
If a forklift is replaced with a new forklift that has twice the power, How much greater a load can it lift in the same amount of time?

14. POWER PROBLEM
If it lifts the same load, how much faster can it operate?

15. MECHANICAL ENERGY
Energy due to the position or the movement of of “something”.
Potential energy
Kinetic energy

16. POTENTIAL ENERGY
Energy that is in a stored state and has the “potential” to do work.
Fossil fuels, electric batteries and food contain Potential energy.

17. Gravitational Potential Energy
Potential energy due to elevated positions.
Gravitational Potential energy = weight x height
PE = mgh

18. Gravitational Potential Energy
GPE = Wt. x h Or
GPE = m x g x h

19. Potential Energy Problems
How much work is done on a 100 N boulder when you lift it 1 m?
What power is expended if you lift the boulder a distance of 1 m in a time of 1 s?

20. Potential Energy Problems
What is the gravitational potential energy of the boulder in the lifted position?

21. Kinetic Energy Energy of motion KE = ½ mv2
When you roll a ball you do work on it to give it speed. The moving ball can hit something and to work on it.

22. Kinetic Energy Forms
Thermal energy
Acoustical energy
Radiant energy

23. Pendulum

24. Pendulum
Maximum Potential Energy
Zero Kinetic Energy

25. Pendulum Zero Kinetic Energy Maximum Kinetic Energy
Maximum Potential Energy
Zero Kinetic Energy
Maximum Kinetic Energy
Zero Potential Energy

26. Pendulum Zero Kinetic Energy Maximum Kinetic Energy
Maximum Potential Energy
Zero Kinetic Energy
Maximum Kinetic Energy
Zero Potential Energy

27. Pendulum Maximum Potential Energy Zero Kinetic Energy
Maximum Kinetic Energy
Zero Potential Energy

28. Pendulum Maximum Potential Energy Maximum Potential Energy
Zero Kinetic Energy
Zero Kinetic Energy
Maximum Kinetic Energy
Zero Potential Energy

29. Energy cannot be created or
Law of Conservation of Energy
Energy cannot be created or
only changed
destroyed,