Energy 1
Define energy
the ability to do work
What energy transformations happen when you play violin?
Kinetic energy (fueled by chemical energy stored in your body) to sound energy and some thermal energy (friction)
What is the transfer of energy from one object to another?
heat
What is the transfer of energy when a force makes an object move?
Work
ehat
heat
The sum of kinetic and potential energy in a system?
energy in motion
kinetic energy
Energy can not be lost or destroyed, only transformed into a different form of energy. True or False
True, Law of Conservation of Energy
Why is there no such thing as feeling 'cold'?
You are losing heat, not gaining cold.
How much work did I do when I lifted a 1 kg book a 1.5 m height?
14.7 J
AHMRTEL
thermal
Where does a rollercoaster have the most kinetic energy?
Bottom of drop/hill
Lowest part of track
Type(s) of energy used by an oven use to bake cakes.
Electric energy and thermal energy
A hair dryer transforms _______energy to _____ energy and ________ energy.
electrical, thermal and sound
True of false:
Heat normally moves from hot to cold, but this changes sometimes.
False. It is always from hot to cold.
What two conditions must be met for work to be done?
Object must move
Force applied in direction of movement
TEPLTIOAN
potential
What is the mass of a box with 850 Joules of stored energy and 1.5 m up in the back of a truck?
57.82 kg
Something that carries energy well
What is the energy transformation when you rub your hands together
kinetic/mechanical to thermal
If there is friction between 2 moving bodies, then mechanical energy is converted into............
thermal energy/heat
Factors on which power depends
amount of work done
time taken by source to do the work
TECAICELLR
electrical
If you have a bowling bowl, basketball, and a tennis ball moving in the same speed, which ball have more kinetic energy? Why?
Bowling ball, more mass
Define Nuclear Energy
Energy stored in the nucleus of an atom.
You inherit an old family pocketwatch, explain the energy transformations to allow it run.
What is the sum of kinetic and potential energy in the particles of an object
thermal energy
The amount of work done in a certain time.
What is power?
airtand
radiant
You get a sunburn at the beach. What type of thermal energy transfer is this?
Radiation
What are 3 types of stored/potential energy?
Elastic, Chemical, Gravitational
Example of a transformation where Electrical energy is transformed to Radiant, then Thermal and Sound energy.
Lightning
TV or computer or phone
How much thermal energy will you need melt a .25 kg glass of ice water from 8 degree C to 20 degree C? The specific heat of water is 4184 J/kg C.
12,552 J
If you lift a 5 kg ball 1.5 m off the ground, how much work did you do?
73.5 W
CINCLMAAHE
mechanical
You accidentally bump your hand on the oven while getting the cookies out. What type of thermal transfer is this?
Conduction
How much energy does a .25 kg jar have while sitting 2.5 m above the ground?
6.125 J
Energy transformation needed for you to see a star
nuclear to radiant/electromagnetic/light
What is the measure of average kinetic energy in particles in an object?
temperature
What type of thermal energy transfer powers the wind?
Convection currents
elicmahc
chemical
Factors that potential energy depends on
height
acceleration
mass
How much energy does a 800 kg car have while traveling at 7 m/s?
19,600 J
What are the types of energy transforming when you charge a battery?
electrical to chemical
What are things like plastic, wood, Styrofoam, fiberglass, air, and rubber?
insulators, they do not allow heat to flow easily
Name the 3 types of thermal energy transfer?
conduction
convection
radiation
TOOANFNAIMRSRT
transformation
Amount of heat it takes to raise 1 kg of a substance, 1 degree C/K is called...
specific heat