konversi energi

KONVERSI ENERGI

KONVERSI ENERGI

KONVERSI ENERGI

KONVERSI ENERGI

KONVERSI ENERGI

KONVERSI ENERGI

KONVERSI ENERGI

KONVERSI ENERGI

The water above receives energy as it falls down the short waterfall. This energy was stored as potential energy in the gravitational field of the Earth and came out of storage as the water dropped. This energy which came out of the gravitational field ended up being expressed as the kinetic energy of the water. That is, the water gains kinetic energy as it drops. An ounce of water is going faster when it hits the bottom of the waterfall than it was when it went over the top of the waterfall.

KONVERSI ENERGI

KONVERSI ENERGI

W = Fd Work equals the applied force times displacement.

W = Fgd The applied force equals the weight of the object.

W = mgd The weight of the object equals its mass times the acceleration due to gravity.

W = mgh The displacement over which the work is done equals the height of the lift.

Energy that is stored in the gravitational field is called gravitational potential energy, or potential energy due to gravity.

W = Fd Work equals the applied force times displacement.

W = Fgd The applied force equals the weight of the object.

W = mgd The weight of the object equals its mass times the acceleration due to gravity.

W = mgh The displacement over which the work is done equals the height of the lift.

KONVERSI ENERGI

Ug Symbol for gravitational potential energy Ug= mgh

Ug = mgh Formula for gravitational potential energy.

Ug = (4 kg)(9.8 m/s/s)(5 m) Plug in values for mass, acceleration due to gravity, and height.

Ug = 196 J

Sample CalculationWhat is the gravitational potential energy for a 4 kg object that is lifted 5 m?

Once the work has been done lifting the object, and the energy has been stored in the gravitational field, how is this potential energy released? Very simply, the object can be dropped. As it falls its height above ground gets less and less, so, the potential energy stored in gravity gets less and less, also. The object, though, is speeding up as it falls. Energy is leaving the gravitational field and entering the falling object as kinetic energy. Kinetic energy is the energy of motion.

As the object falls it travels faster and faster, and thus, picks up more and more kinetic energy. This increase in kinetic energy during the fall is due to the drop in gravitational potential energy during the fall. The gravitational potential energy becomes the kinetic energy of the falling object.

KONVERSI ENERGI

KONVERSI ENERGI

KONVERSI ENERGI

KONVERSI ENERGI

KONVERSI ENERGI

KONVERSI ENERGI

KONVERSI ENERGI

KONVERSI ENERGI

KONVERSI ENERGI

KONVERSI ENERGI