13 terms

Mechanical Energy

energy
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energy
the ability of an object to do work
mechanical energy
energy associated with the motion or position of an object
heat (thermal energy)
energy caused by internal motion of atoms
chemical energy
energy in bonds of atoms
electromagnetic energy
energy of moving electrical charges
nuclear energy
energy in the nucleus of an atom
potential energy (PE)
-energy of an object due to its position
-PE is stored energy
-object has potential to do work
-depends on object's mass and height above the ground
-at ground level, PE=0 J, Height=0 J
PE=mgh
gravitational PE
potential energy associated with an object's height
PE and KE Units
Joules
Kinetic Energy (KE)
-energy of an object due to its motion
-depends on mass and velocity
-KE increases as speed increases (affects more)
-KE increases as mass increases
-objects at rest KE=0 J, Velocity=0 m/s
-as an object falls it loses PE (height is decreasing) and it gains KE (velocity is increasing)
KE=1/2mv^2
Conservation of Energy
-energy cannot be created nor destroyed, only changed into other forms of energy, work, and passed onto other objets
-ultimate source of energy for our solar system is the sun
*wasn't created there
work-energy theorem
-the total work done on an object is equal to the change in energy for that object
-lift a ball with 10J
*your energy=0J
*gravity's potential energy=10J
Mechanical Energy
-ME= sum of kinetic energy and potential energy
ME=KE+PE
-potential energy at top is kinetic at bottom
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