Energy Flashcards
How often do we use energy?
Everyday
What is respiration?
Releasing energy
What is energy be measured in?
Joules (J)
What is kinetic energy?
Energy when you are moving
What is chemical energy?
Food, fuel and batteries contain chemical energy
What is gravitational energy?
The higher something drops, the louder it is.
What is elastic energy?
The more you stretch something, the more energy it uses.
What is thermal energy?
The sun gives out its energy as heat (kettle, radiator)
What is the law of conservation energy?
Energy cannot be created or destroyed only transferred from one form to another
What is mass?
How much matter makes up the object
What is weight?
Force acting down on mass
How do you work out mass?
Kinetic energy
———————
1/2 x velocity(2)
Speed equation
Kinetic energy
——————-
1/2 x mass
What is velocity?
Speed with a direction
What are the 4 different transfers?
Force, heating, waves, current
Gravitational potential energy equation
GPE(J)= mass(kg)x gravity(n)xheight(m)
What is elastic potential energy?
When materials are stretched or squashed, the work you do on them (energy) is stored as elastic potential energy
Elastic potential energy equation
EPE(Ec)= 1/2 x spring constant x extension(2)x e(2)
Equation for work done
Work done(J) = force applied(N) x distance moved along the line of action of the forces(metres)
Efficiency formula
Useful power output
—————————
Total power input
Dissipate
Energy that is spread and will not be used again
Efficiency
A measure of how good a device is at changing energy from one form to another
Energy transfer
The process of changing energy from one form into another
Input energy
The energy going into a device
