Topic 1 Flashcards
(14 cards)
What is the equation for kinetic energy?
KE = ½ × mass × velocity²
What is the equation for gravitational potential energy?
GPE = mass × gravitational field strength × height
What is the unit of energy?
Joule (J)
Name four types of energy stores.
Kinetic, thermal, chemical, gravitational potential (also: elastic, nuclear, magnetic, electrostatic)
What is the principle of conservation of energy?
Energy cannot be created or destroyed, only transferred
What energy transfers occur when an object falls?
GPE → KE
What is power and its equation?
Power = energy transferred ÷ time
What is the equation for work done?
Work = force × distance
What are the units of power?
Watts (W)
What is efficiency?
Efficiency = (useful output energy / total input energy) × 100
What is a Sankey diagram used for?
To show how energy is transferred in a process, including wasted energy
What is thermal energy?
Energy stored in the movement of particles (temperature)
What is elastic potential energy?
Energy stored in stretched or compressed objects
