Conservation And Dissiption Of Energy Flashcards
(13 cards)
What is meant by the term ‘energy is always conserved’?
The total amount of energy present stays the same before and after any changes
What is kinetic energy?
The energy an object possesses by virtue of its movement
What determines the amount of kinetic energy possessed?
The mass of the object and its speed
What is gravitational potential energy?
is the energy an object has by virtue of its position above the surface of the Earth.
When work is done in raising the height of an object, what happens?
Energy is transferred as a gain in the gravitational potential energy of the object.
Equation for work done
Work done = force X distance upwards
Equation for energy transferred to potential energy when raising the object through a known height
Energy = mass X gravitational field strength X height
Why can energy not be made or destroyed?
It’s just converted into one form into another
When energy has been converted what are the two types?
Wasted and useful
What is potential energy?
the energy possessed by a body by virtue of its position relative to others, stresses within itself, electric charge, and other factors.
What are the units for work done?
Joules
What are the units for power
Watts
How do you calculate kinetic energy?
The formula for kinetic energy is: 0.5 x m x v2(squared). The units are joules. Distance divided by time gives speed.
