Definitions
What is Mechanical energy?
a quantity which gives objects the ability to do work or cause change
mechanical energy
ME=KE+PE
If the kinetic energy is 250,000 and the potential energy is 200,000 what is the mechanical energy?
ME= 450,000
what is Kinetic energy? what does it depend on?
energy of an object in motion. depends on mass and speed.
gravitational potential energy
PE=mgh
What is the PE of a 6 kg sledgehammer held 3 m above the ground?
PE= 176.4 J
what is potential energy? what does it depend on?
stored energy due to an objects height. depends on mass and height.
kinetic energy
KE=1/2mv2
what is the KE a 30 kg child running at a rate of 8 m/s?
KE=960 J
Work depends on what three variables?
the amount of Force, the amount of displacement, the angle between the force and displacement.
what is the work formula?
W= (f)(d)(cos)