Topic P3 Flashcards
List energy transfers
Forces heating light sound electric current
List types of energy stores
Nuclear/atomic Sound gravitational potential light electrical kinetic thermal elastic potential chemical/battery
What is efficiency
Efficiency is a measure of the percentage of energy transferred usefully
What is the equation for efficiency
Efficiency equals useful energy out / total energy in x100
What is the equation for gravitational potential energy?
Gravitational potential energy = Mass (kg) x Gravitational filed strength (N/kg) x Change in height (m)
What is the equation for kinetic energy?
Kinetic energy = 0.5 x Mass (kg) x Velocity (m/s)2
Where does heat loss occur in houses?
Roof- convection and conduction
Chimney- convection
Windows- radiation
Door radiation
Why can heat be lost?
The lack of:
Thickness
Thermal conductivity
Temperature difference
What are methods of thermal conductivity?
Conduction- vibrate between particles good conductors, metal, bad conductors, Wood.
Convection-liquid or gas rises to form a convection current.
Radiation-Transfers heat through gases and solids. Emitted by Dr surfaces. Paul limited by light shiny surfaces.transfers heat through gases in solids. Omitted by Dr all surfaces. Paul limited by light shiny surfaces.
What’s newtons 3rd law?
Whenever two objects interact, the Axa equal and opposite forces on each other.
Access to different objects.
Are of the same types/mass
What is vector?
A physical quantity that is described with magnitude and direction. (Number + distance)
What is scalar?
Physical quantity that subscribe button by your side.(number)
List examples of scalar
Distance speed time mass power temperature work voltage
List examples of vector
Acceleration displacement velocity force momentum
What’s the equation for speed
Speed + distance / time
