Energy Flashcards
What is energy
Energy is the ability to do work
How is energy measured
Energy is measured in Joules
What is the equation for work done
Work done = force (N) * Distance (m)
How can you find the amount of energy transferred to an object
Find the amount of work done
What are the eight energy stores
Gravitational Energy Kinetic Energy Elastic Energy Thermal Energy Chemical Energy Magnetic Energy Electrostatic Energy Nuclear Energy
How do objects gain Gravitational Potential Energy
Objects gain G.P.E by increasing by moving higher
What is the equation for G.P.E
mass (kg) * gravitational force (10) * height (m)
Name 2 objects that store G.P.E
An object on top of a shelf, an airplane flying
How do objects that store Kinetic Energy have the ability to do work
Objects that store K.E have the ability to do work by changing their speed
What is the equation for K.E
mass * speed (squared) / 2
Name 2 objects that store K.E
A person running, A moving bike
How do objects that store elastic energy have the ability to do work
Objects that store elastic energy have the ability to do work by changing their shape
Name 2 objects that store elastic energy
A stretched bow, a slinky
How do objects that store thermal energy have the ability to do work
Objects that store thermal energy have the ability to do work by changing their temperature
Where is chemical energy stored
Chemical energy is stored in the bonds between the particles of the material
What are four ways of energy transfer
Mechanically: energy is transferred when a force acts through a distance
Electrically: Energy is transferred by the flow of electric charge in an electrical circuit
By Heating: energy transferred due to temperature difference
By Radiation: Energy transferred by waves
How is energy transferred through heating
Energy is transferred from a hotter object to a cooler one, causing the difference in temperature between them to decrease
How is energy transferred mechanically
Energy is transferred when a force acts through a distance, causing the position of an object to change
How is energy transferred electrically
Energy is transferred electrically through the flow of electric charge in an electrical circuit
How is energy transferred through radiation
Energy is transferred by waves through materials and from place to place
What is the equation for efficiency
useful energy output / total energy input
Where is wasted energy transferred to
Wasted energy is transferred to the surroundings as thermal energy
