1In an open system
energy and matter can be transferred between the system and its surroundings
2In a closed system
A system in which no matter is allowed to enter or leave
3In an isolated system
is unable to exchange energy or matter with its surroundings
4Conservation of energy
Energy cannot be created or destroyed
5When a force causes an object to move
Work is done against frictional forces
6If a force acts in the direction the object is moving
The object gains energy (usually KE)
7If a force acts in the opposite direction to the movement
The object loses energy (usually heat)
8Work done equation
E = Fd
9Change in GPE
mass x gravitational field strength x change in height