P1: Conservative And Dissipation Of Energy Flashcards
What is the conservation of energy?
Energy can’t be created or destroyed, only transfered from one type to another
What is work?
Work done is energy Transferred
Its when a forces makes an object move
What is power?
The rate of doing work(speed)
Measured in Wats(W)
Equation for work(J)
Force x distance
Equation for power
Energy/time
What are the four carriers or energy transfer pathways?
Radiation
Mechanical work
Electrical work
Heating
What are the 8 types of energy store?
magnetic. internal (thermal) chemical. kinetic. electrostatic. elastic potential. gravitational potential. nuclear.
What is the principle of conservation of energy?
Energy can’t be created or destroyed it can only be transfered from one type to another
Shat does potential mean?
A store
Is light an energy store?
No because light is a transfer of energy not a source
How can energy be stored?
In a variety of diffrent energy stores
How is enegy transferred when it moves an object?
- heating
- waves
- electrical current
- force
When an object falls an gains speed what increases and decreases?
Kenetic energy increases
Gravatational potential energy decreases
What happens when a falling object hits the ground without bouncing?
Its kenetic energy store decreases
-thermal energy store of the surroundings increase
Energy is also transfered by sound waves
What is a closed system?
A sustem where no energy transfers take place out if or into rhe enerfy stores of the system
Can energy be transferred between energy stores in a closed system
Yes
What is the equation for work done?
Force x distance moved
What is the equation for the change in gravatational potential energy store in an object?
E= m x g xg
What does the kenetic energy of an object depend on?
Is mass and speed
What is the equation of kernetic energy store of an object?
0.5 x mass x velocity squared
What is the eleastic potential energy of an object?
The energy stored in an elastic object when its doing work
What is the equation for the elastic potential energy stored in a spring?
0.5 x kenetic x energy squared
What is useful energy?
Energy in the place we want and the form we need it
What is wasted energy?
Not useful energy, transferred by an undesired pathway
What is the effciency of a device?
Iseful energy rptransferred by the device divided by total energu supplied to the device
X 100
Simple ex: Useful divided by total
X100
Power of an appliance?
P = e dived by t
Effciency of an appliance?
Useful power out divided by total power in
X100
Power wated by an appliance?
Total power input-useful power in put
Gravatational potential energy equation?
Mass x gravity x height
Kenetic energy equation?
0.5 x mass x velocity squared
Elastic energy equation?
0.5 sping constant(k) x extention (e) squared
Work equation
Force x distance
Energy equation
Power x time
