P1- Year 9 Flashcards
What does transfer mean?
The conservation of one store of energy to another
What are some different energy stores?
Kinetic (movement)
Chemical (chemical bonds eg, fuel)
Gravitational potential (due to an objects position above ground)
Elastic potential (stored in objects that can stretch or compress)
Thermal energy (heat)
What is the conservation of energy?
Energy cannot be created or destroyed, only
transferred from one store to another or dissipated into the surroundings
What is dissipation?
Energy that is not transferred usefully (usually wasted energy )
Fill in the blank
Energy cannot be ____ or destroyed
Created
True/false
The conservation of energy doesn’t apply too all energy changes
False- it applies to ALL energy changes
What is the unit of measurement for energy (work done)?
Joules (J)
What is the unit of measurement for force?
Newtons (N)
What is the unit of measurement for distance?
Metres (m)
What is work?
The energy transferred by a force
What is displacement?
The change in position of an object
What is the definition of weight?
The force acting on an object due to the gravitational force
What is potential?
Stored energy due to its position in a system
What is the definition of extension?
The increase in the length in an object when a force is applied
What is the definition of directly proportional?
The same thing happens to both values (e.g doubling)
What is useful energy?
Energy that is in the place we want it and in the form that we need it to be in
What is wasted energy?
The energy that is not useful and is transferred by an undesirable pathway
Where is wasted energy usually transferred to?
The surroundings (dissipated)
What can no energy transfer be more than?
100% efficient
What is the definition of power?
The rate of energy transfer
