Physics- Energy stores and systems

What is the law of conservation of energy?

Energy is always conserved. Energy cannot be created or destroyed, it can only be transferred from different stores/objects (however it can be turned into mass)

Kinetic energy

Energy an object has because it is moving

Equation for kinetic energy

EK=0.5MV2

Gravitational potential energy

Energy an object has because of its height above the eaths surface

Equation for gravitational potential energy

EGP=mgh

Elastic potential energy

Energy an elastic object has when it is stretched or compressed

Equation for elastic potential energy

EE=0.5KE2

What is meant by a closed system

In a closed system, energy cannot be transferred from or to the surroundings

Unit of measurement for energy

J (Joules)

Unit of measurement for velocity

m/s

Unit of measurement for mass

kg

Unit of measurement for gravitational field strength

N/kg

Unit of measurement for height

m

Unit of measurement for spring constant

N/m

Unit of measurement for extension

m

Define dissipated energy

“wasted energy”. energy that is transferred to the surroundings and not been used usefully.