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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 4th 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=1/2mv2 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/s2 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?