CP3 Energy Flashcards
(18 cards)
What is energy measured in?
joules
What type of energy is stored in a moving object?
kinetic energy
What is it called when energy is transferred by a force?
mechanically
What happens to the kinetic energy of a car when it brakes?
thermal turns into the surroundings
What is conservation of energy?
energy cannot be created or destroyed
What type of energy is stored in foods, batteries and fuels?
chemical energy
What does it mean if energy is wasted?
turns into an energy we don’t need
What would it mean if a kettle had a very high efficiency?
boils the water faster
What does it mean if a light bulb has a very low efficiency?
most of the energy is being wasted
What does effeciency mean?
how much energy is wasted and how much energy is useful
What number is efficiency always less than?
1
What is the formula or effciency
useful energy / total energy
Thermal Conduction
The movement of heat through a substance
What is the formula for gravitational potential energy?
Gravitational potential energy = mass x gravitational field strength x height
What is gravitational potential energy measured in?
joules
What is mass measured in?
kg
What is gravitational field strength measured in?
N/kg
