Energy Basics
Energy is the ability to do what?
What is work?
All forms of kinetic energy have this in common
What is motion?
This kind of potential energy exists in the food we eat, gasoline we put in our cars, and in fireworks
What is chemical energy?
You hit a drum with a drumstick. Describe the energy transformation (2 forms)
mechanical-->sound
Ice cream melts in a bowl because of this type of heat transfer
Conduction
Mrs. Buchanan pushes on her Prius with all her might, but it doesn't move (forgot to put it in neutral). Has she done any work?
The two variables that affect kinetic energy
what are mass and speed
The type of energy that occurs from changing an objects shape by stretching or compressing it.
You plug in an iron to press your clothes. What is the transformation (2 forms)
Electrical --> thermal
Many weather patterns occur because warm air is rising in the atmosphere while cooler air is sinking. Which kind of heat transfer does this describe?
Convection
You buy a Cadbury's chocolate bar, manufactured in England. It tells you the number of Kilojoules in the chocolate. What is this a measure of?
The amount of energy.
The kind of kinetic energy that exists due to the movement of electrons
What is electrical energy?
Gravitational potential energy is dependent on these two factors
A ball rolls across the field and eventually comes to a stop because friction causes this transformation
Mechanical--> Thermal
Thermal energy reaches us from 93 million miles away because of this type of heat transfer
Radiation
You throw a basketball in the air, at its highest point, describe the amount of gravitational and the amount of kinetic energy.
The gravitational potential energy is at its highest, kinetic energy is zero because the ball stops for a brief moment.
What is thermal energy?
This type of energy is the most concentrated form of potential energy, with the ability to generate much electricity but also able to cause much damage
What is nuclear energy?
After you eat some Nerds Gummy Clusters, you're running in the house, trip, and skid across the carpet, giving yourself rug burn. (3 forms)
Chemical-->Mechanical-->thermal
Mrs. Buchanan is drag racing in her Prius against Chuck Norris in his Dodge Ram Charger. If they are going at the same speed, whose vehicle has the greater kinetic energy?
Chuck Norris because the Ram Charger has a greater mass.
The two types of kinetic energy that move in waves
What are sound and radiant?
The reason that a boulder has a greater gravitational potential energy than a pebble sitting on the same ledge of a cliff.
What is the greater mass?
A battery powers a flashlight (3 forms)
Chemical--> electrical--> radiant
When you get in a hot car in the summertime, the metal of the seatbelt burns your skin, but the fabric part doesn't. Why?
The metal is a thermal conductor while the fabric is a thermal insulator