.jpg)
mechanical energy
kinetic energy and gravitational potential energy, including energy called mechanical energy. makanik energy is the amount of potential energy and kinetic energy possessed by an object, and is also the total energy. amount of mechanical energy of an object is always fixed, while the kinetic energy and potential energy can be changed-ubah.energi potential + kinetic energy.formula: E = Em + Ek
example:
a body is at rest at a height of 80 cm, 5 kg of body mass, and acceleration of gravity g = 10 m/s(squared). determine the mechanical energy of the object.
resolution:
means it does not have the speed or v = 0, whereas the object height h = 80cm = 0.8 m.
then: Em = Ep + Ek = mgh + 1/2mv (squared) = 5.10.0,8 + 0 = 40 joules.
so, the mechanical energy of objects that dwell on the table will be equal to the potential energy, since kinetic energy is zero.