1. Energy – the ability to do work W = Fd = m a d Vf 2 = Vi2 + 2aDx Vf 2 - Vi2 = + 2aDx Vf 2 - Vi2 = aDx

2. W = Fd = m(Vf 2 - Vi2 ) 2
W = Fd = 1 mDv2
Kinetic Energy – energy of motion
KE = Ek = 1 mv2
units: kg (m/s) 2 = kg m 2 /s 2 = kg m/s 2 m
= N m
= Joule

3. 1. Determine the kinetic energy of a 625-kg roller coaster car that is moving with a speed of 18.3 m/s.

4. 2. If the roller coaster car in the above problem were moving with twice the speed, then what would be its new kinetic energy?

5. Work-Energy Theorem Wnet = DEk Fd = KEf – KEi Fd = 1 mv2f - 1 mv2i 2 2

6. Gravitational Potential Energy GPE = Ug = mgh units: kg m/s2 m = Joule

7. Assignment Take out a sheet of paper:
Give me four potential and four kinetic energy examples

8. Elastic Potential Energy PEelastic = Us = ½ kx2 k = spring constant units: N m2 = N m m equilibrium

11. Mechanical Energy – sum of all kinetic energy and all types of potential energy ME = KE + SPE Law of conservation of Mechanical Energy Energy cannot be created nor destroyed, it can only changed from one form to another MEi = MEf

12. Law of Conservation of Energy PE + KE = PE + KE PE = KE Ug = Ek mgh = 1 mv2 2

13. It will be graded so sign in with your name
Kahoot ! Get ready

14. Kahoot :PE or KE?

17. Look at Spock

18. Man in air

19. Look at bain!

21. Whats the dino doing? PE or KE?

24. Now give me two potential and kinetic in notebook