 energy the ability to do work  When work is done on an object, energy is transferred to that object. Work is a transfer of energy.

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Presentation transcript:

 energy the ability to do work

 When work is done on an object, energy is transferred to that object. Work is a transfer of energy

 The major forms of energy are mechanical energy, thermal energy, chemical energy, electrical energy, electromagnetic energy, and nuclear energy

 The energy associated with the motion and position of everyday objects is mechanical energy ◦ We will study forces and motions next

 thermal energy the total potential and kinetic energy of all the particles in an object ◦ We will study this month

 Chemical energy is the energy stored in chemical bonds. ◦ We just got done studying chemical reactions!

 Electrical energy is the energy associated with electric charges. ◦ We will do a little electricity in may

 Electromagnetic energy is a form of energy that travels through space in the form of waves. Visible light and X-rays are examples of electromagnetic energy ◦ We will do a little light energy 4 th quarter

 The energy stored in atomic nuclei is known as nuclear energy.

 Comparing energy, we subdivide it into two categories.

 The energy of motion is called kinetic energy  KE=1/2mv 2

 A 70.0-kilogram man is walking at a speed of 2.0 m/s. What is his kinetic energy?  A 1400-kilogram car is moving at a speed of 25 m/s. How much kinetic energy does the car have?  A 50.0-kilogram cheetah has a kinetic energy of 18,000 J. How fast is the cheetah running? (Hint: Rearrange the equation to solve for v.)

 Potential energy is energy that is stored as a result of position or shape.  Potential energy that depends upon an object's height is called gravitational potential energy.  PE=mgh  G=gravity, 9.8 m/s 2

 A 60.0-kg person walks from the ground to the roof of a 74.8-m-tall building. How much gravitational potential energy does she have at the top of the building?