Mechanical Energy Mechanical Energy is a combination of
Mechanical Energy
Mechanical Energy is a combination of two fundamental types of energy: n n
Mechanical Energy is a combination of two fundamental types of energy: n Kinetic energy (the energy of motion) n Potential energy (energy that is stored) - Gravitational Potential energy
Kinetic Energy n n The kinetic energy of an object of mass m, in kg, and speed v, in m/s:
Kinetic Energy The work done by the net force causes a change in speed n The kinetic energy of an object of mass m, in kg, and speed v, in m/s: n
Gravitational Potential Energy n Ex: A mass m is lifted from a height h 1 to a height h 2 at a constant speed.
Gravitational Potential Energy n “stored energy” in an object at a particular height w. r. t. a reference point. Ex: A mass m is lifted from a height h 1 to a height h 2 at a constant speed.
Gravitational Potential Energy n The gravitational potential energy Eg of an object of mass m, in kg, that is at height h, in m, above the reference point is: n g = 9. 8 m/s 2
Gravitational Potential Energy n The gravitational potential energy Eg of an object of mass m, in kg, that is at height h, in m, above the reference point is: n g = 9. 8 m/s 2
W. E. T. (Work-Energy Theorem) n The total work done on an object equals the change in the object’s kinetic energy OR gravitational potential energy, but NOT BOTH.
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