Energy
Energy Transformations
Specific Heat
Heat Transfer
100
T/F: Energy is the ability to do work or cause change.
True
100
What does the law of conservation of energy state?
Energy cannot be created or destroyed
100
What is temperature?
Measure of the average kinetic energy of the molecules of a substance.
100
T/F: Heat always transfers from a warmer object to a cooler object.
True
200
What is the primary difference between kinetic energy and potential energy?
Kinetic energy is energy of motion; potential energy is stored energy due to position.
200
A ball starting at rest begins to roll down a hill. What energy transformation occurs?
Potential to Kinetic
200
What is specific heat?
Amount of energy needed to change the temperature of 1 gram of a substance by 1 ०Celcius.
200
What are the ways heat is tranferred?
Conduction
Convection
Radiation
300
What are the two types of energy that are potential?
Chemical & Nuclear
300
What type of energy transformation occurs when you plug in a toaster?
Electrical → thermal
300
What do the letters mean in Q=mcΔT ?
Q = heat energy lost or gained, measured in Joules (J)
m = mass, measured in grams (g)
c = specific heat, measured in (J/g *℃)
ΔT = change in temperature (Final temp – starting temp), measured in ℃
300
Which of the following is the best example of heat transfer by conduction?
boiling water in a pot
the sun warming your face
touching a hot metal spoon
hot air rising from a fire
touching a hot metal spoon
400
What are the 4 types of energy that are kinetic?
Radiant, Sound, Electrical & Thermal
400
Which situation involves the transformation of mechanical energy to electrical energy?
A bunny eating
A wind turbine spinning
A solar panel in sunlight
A battery in a remote control
A wind turbine spinning
400
A 175 g sample of silicon is heated from 22 C to 55 C. How much heat energy was absorbed during this process?
Specific heat of silicon: 0.703 J/g . C
3690.8 J
400
In a boiling pot, what type of heat transfer cooks the noodles?
Convection
500
Define the 9 types of energy
:)
500
Which of the following is an example of chemical energy being transformed into thermal energy?
boiling water on a stove
lighting a match
a ball rolling down a ramp
a lightbulb glowing
lighting a match
500
A 55 g sample of an unknown metal requires 2140 J of heat to change its temperature by 100oC. Based on the chart, what is the identity of the metal?
Zinc
500
Define the following:
Radiation
Conduction
Convection
Radiation: The transfer of heat through electromagnetic waves.
Conduction: The exchange of thermal energy by direct contact.
Convection: The transfer of heat by moving currents in gases and liquids.