Energy Flashcards
system
change in object = change in energy store
closed system
no net change when transferring energy, theorised
open system
energy is transferred with surroundings, net change
net
total amount of energy
work
ability to work against a type of energy
work done
energy transferred (F x D)
mass
matter in an object, kg
weight
gravitational force acting on an object, newtons
objects gain GPE when . . .
held above original position (M x G.F.S x H)
kinetic energy
energy an object has when moving (1/2 x M x V2)
elastic potential energy
energy stored in a stretched material
elastic material
regains original positions once force acting has been removed
plastic material
remains permanently deformed once force acting has been removed
Hooke’s law
spring constant is proportional to stretching force, provided limit of proportionality is not exceeded (k x E
efficiency
measure of how well a system transfers energy from one type to another (U.P.I / T.P.I)
