6.8 A Potential and Kinetic Energy

6.8 A Potential and Kinetic Energy

by Ms. Lobdell

​What is a system?

• ​a group of interacting or interdependent pieces forming a complex whole

• ​all factors or variables that make up an experiment

• ​set of things or parts all related

• ​force is added to systems to make them work or do something

Multiple Choice

What is not an example of a system? 

• solar system 

• planet

• pulley 

• organ system 

​What is energy?

• ​the ability to use force to move an object over a distance or to cause a change in matter

• ​can be measured using Joules (J)

Multiple Choice

What is the unit for energy?

• calories

• joules

• grams

• milimeters

​Joule (J)

• ​unit used to measure energy

• ​how much energy is needed for a change to happen in a system

• ​represented by J

Types of Energy

• ​Examples:

  • ​mechanical

  • ​light

  • ​sound

  • ​electrical

  • ​thermal

  • ​chemical

​Energy Transformations

• ​change of energy from type/form to another

• ​energy cannot be created or destroyed

  • ​Law of Conservation of Energy

Open Ended

Give an example of an energy transformation!

Categories of Energy

• ​Potential Energy

• ​Kinetic Energy

• ​All types of energy can be categorized using the two

​Potential Energy

• ​energy stored in an object

• ​energy waiting to happen

• ​has the potential/possibility to move but has not yet

Multiple Choice

Which is an example of Potential Energy? 

• a child playing

• a dog running

• an apple on a desk

• riding a bike

​Kinetic Energy

• ​energy of motion

• ​only matter in motion has kinetic energy

Multiple Choice

Which is an example of kinetic energy? 

• a cat leaping

• a car at a stop sign

• a shoe on the ground

​Total Energy

• ​all of the potential energy and kinetic energy of a system

• ​TE = PE + KE

Multiple Choice

What is the TE of a system with PE = 32J and KE = 12J?

• 20J

• 44J

• 55J

• 40J