p3 Flashcards
what does it mean by conservation of energy?
Energy cannot be created or destroyed
what is the useful energy change involved when an object is projected of points or up on a slope
kinetic energy—> gravitational, potential energy
what is the useful energy change involved in a moving object, hitting an obstacle
kinetic energy—> sound energy
what is the useful energy change involved in a vehicle slowing down?
kinetic energy—>thermal
what is the useful energy change involved in bringing water to a boil in a electric kettle?
Electrical energy—> thermal energy
when do mechanical processes become wasteful?
when is equals a rise in temperature so dissipating energy in heating the surroundings
what happens to energy in all a system changes
it is dissipated
give two ways of reducing unwanted energy transfer
lubrication, thermal insulation
