Done By Gong Chen

1. Work Energy Power
WORK POWER
ENERGY

2. Work
 Definition: The work done by force is defined as the product of that force
times the parallel distance over which it acts.
Work = Force X Distance
SI Unit: Nm , Joule

3. Types of Energy
Energy: the capacity to do work
 Chemical Energy (e.g. Fuel, Battery)
 Electrical Energy (e.g. Electric Appliances )
 Mechanical Energy
 Kinetic Energy And Potential Energy
 K.E: a moving object
P.E: Gravitational Potential Energy
Elastic Potential Energy
 Nuclear Energy [

4. Kinetic Energy
 Kinetic Energy is the energy possessed by an object because it is in
motion.
2
2
1
mvKE 
What Energy Is converted to KE when you run?

5. Gravitational Potential Energy
 Gravitational Potential Energy is the energy possessed by an object
because of a gravitational interaction.
mghPEG 
What is your GPE at 10 m above the ground (your mass 60 kg)?

6. Conservation of Energy
 Energy can neither be created nor destroyed, but only transformed from
one kind to another.
finalinital )PEKE(W)PEKE( 

7. Power
 Power is the time rate of doing work.
SpeedForce
workthisdotaken totime
forceabydonework
erAveragePow


SI Unit: JS-1 or Watt (W)