Physics Flashcards
List all the energy stores
Kinetic, elastic, gravitational, thermal, and nuclear
List all the ways energy can be transferred
Mechanical, electrical, heating and radiation
Define energy
Power required for physical or mental activity.
What is a closed system?
A system in which no substances can enter or leave during a reaction.
What is an open system?
A system in which substances can enter or leave during a reaction.
What is the quantitative of energy?
Joules (J)
What is Dissipation?
Process of energy being lost from a system, most likely in the form of heat
Formula for Kinetic Potential Energy?KPE
KPE(J) = 0.5 x Mass (kg) x Movement/Speed *2
Formula for Gravitational Potential Energy?
GPE(J) = Mass(kg) x Grav Field Strength(N/kg) x Pressure/Height(m)
What is work done?
Energy transferred
How to measure power?
Energy/ Time
How to measure efficiency?
(useful energy out/ total energy in) x 100
How to measure heat transferred?
Specific heat capacity(SHC) x mass x change in temp
Formula for Elastic potential energy?
Ee(EPE) = 0.5 x spring constant (N/m) x extension(m) *2
Difference between temperature and heat?
-Temperature measures heat
-Heat is the thermal energy contained in an object
True or False: Insulators have a low SHC (Specific heat capacity)
False, they have a high SHC.
True or False:
Conductors have a low SHC (Specific heat capacity)
True
What is the independent variable?
What we change or control during the experiment
What is the dependent variable?
The variable being tested or measured during the experiment
What is the control variable?
The variable that stays the same/ does not change.
What is resistance measured in?
Ohms
What is the potential difference (voltage)?
Measure of energy
How to work out resistance?
Resistance = potential difference/ current
How to measure potential difference?
V = W/Q
W= energy measured in joules(J)
Q = charge measured in couloumbs
V = voltage (potential diff)
