Chapter 1 Cosversrion And Disspiation Of Energy Flashcards
What is Energy
It’s the ability to do work i killi-joules(kj) or jouls(j)
All energy stores
C
K
Gp
T
Ep
M
E
N
Chemical
Kinetic
Gravitational potential
Thermal
Elastic potential
Magentic
Electrostatic
Nuclear
How can energy be transferred
He
El
Ra/wa
Li
So
Me
Heating
Electrical
Radiation/waves
Light
Sounds
Mechanical
What is conservation of energy
When energy cannot be created or destroyed
Only transfered between stores
What is work (in physics)
the amount of energy transfered when a force moves
Work equation
Work(j) = force(N) x distance(m)
W=F x S
What is friction
Friction is an opposing force to the direction of movement when two surfaces are in contact
What is gravitational potential energy
When an object is lifted in a gravitational field, energy is transferred to a gravitational potential store
GPE equation
GPE(j) = mass(kg) x gravitational field strength(N/kg of m/s^2) x height(m)
E= M x G xH
What is kinetic energy
The energy an object has because of its motion depends on its mass and velocity
Kinetic energy equation
Kinetic energy(j) = 1/2 x mass(kg) x velocity(m/s)
E= 1/2 x M x V
Elastic potential energy equation
Elastic potential energy(j) = 1/2 x spring constant(n/m) x extension(m)^2
Ee= 1/2 x K x e^2
What is spring constant
The value of the stiffness of the spring
The stiffer the spring the greater spring constant
Hooke’s law
States that if you double the force then the extension will double saying force and direction are directily proportinal
What is useful energy
Energy is transfered to where it is wanted and in the form needed
