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Energy and Work Energy- the ability to cause a change. Ex: Baseball hitting a window. The baseball has energy because it caused the change. Different forms of energyradiant, electrical, chemical, thermal and nuclear. Kinetic energy (KE)- the energy in the form of motion. Ex: anything moving - The amount of kinetic energy on an object depends on (1.)mass (more mass = more KE) (2.)velocity (more velocity = more KE) Potential energy (PE)- stored energy. - The amount of potential energy depends on its position. The greater position = more PE. Ex: Flowerpot on windowsill. The higher the windowsill, the greater PE so greater KE. Mechanical energy- the total amount of kinetic and potential energy in a system. Ex: Roller coasters. At the top of hills, they have high PE and low KE. When they go downhill, then they have low PE and high KE. Law of conservation of energy- Energy can’t be created nor destroyed (under ordinary conditions)…..energy just changes forms. Ex: KE is not created…it is changed from PE. Work- a transfer of energy through motion. -When force acts over a distance in the direction of an object’s motion, work is done. 2 things to see if work is done. 1.Movement 2.Motion in same direction as the force. Work equation Variable W = Work F = Force d = distance Ending Units Joules (J) Newtons (N) meter (m) Work Equation W=Fxd F=W/d d=W/F W F . . . . X d