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 What is Energy? Ch. 5---Section 1. Energy  The ability to cause change  Can take many different forms  Kinetic - moving  Potential - positional.

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Presentation on theme: " What is Energy? Ch. 5---Section 1. Energy  The ability to cause change  Can take many different forms  Kinetic - moving  Potential - positional."— Presentation transcript:

1  What is Energy? Ch. 5---Section 1

2 Energy  The ability to cause change  Can take many different forms  Kinetic - moving  Potential - positional  Thermal – Increases with heat  Chemical – stored in bonds  Radiant – light  Sound – vibration of molecules  Electrical – from electricity  Nuclear – stored in atoms  SI unit is the joule (J)  Energy and work are related  Energy is the ability to do work and work is the transfer of energy, therefore they are measured the same way!

3 Kinetic Energy (KE)  The energy an object has due to its motion  If an object isn’t moving it doesn’t have any KE  Depends on both the mass and velocity of an object:  If two objects have the same mass, the one travelling with greater velocity has more KE  If two objects are travelling the same velocity, the object with greater mass has more KE

4 Gravitational Potential Energy (GPE)  The energy an object has due to its position  If an object isn’t moving, it can still have GPE  Depends on both the mass of the object and it’s height above the ground:  If two objects have the same mass, the one that is higher up has more GPE  If two objects are positioned at the same height, the object with greater mass has more GPE  KE and GPE are collectively referred to as Mechanical Energy

5 Potential Vs. Kinetic Energy  Law of conservation of energy - energy cannot be created or destroyed. Potential energy = 50 J Kinetic energy = 0 J Potential energy = 25 J Kinetic energy = 25 J 3. Potential energy = 0 J Kinetic energy = 50 J

6 Thermal Energy  The energy that all objects have that increases when the object’s temperature increases  Due to the motion of molecules that make up the object  Ex. A cup of boiling water has more thermal energy than a cup of cold water, which has more thermal energy than a cup of ice.  Usually is the last step in all energy transformations because it is so hard to store.

7 Chemical Energy  The energy that is stored in chemical bonds  Is released when bonds between compounds are broken  Examples of substances that contain chemical energy:  Wood  Gasoline  Food

8 Radiant Energy (Light Energy)  Energy that is carried by light  Can be converted into thermal energy to warm objects  Light travels at 300,000 km/s, which is fast enough to circle the Earth eight times in one second.

9 Sound Energy  Energy that is transmitted through a medium in the form of vibrations.  Is a mechanical wave – requires material to travel through…cannot travel through a vacuum (No sound in space)  The denser the material, the faster sound will travel (travels fastest in solids)

10 Electrical Energy  Energy carried by an electrical current  Caused by fast moving particles  These particles have charges that attract or repel each other.

11 Nuclear Energy  Energy contained in the nucleus of an atom  Can be released two ways:  fission  fusion


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