Energy Forms and Transformations
A light bulb gives off what two forms of energy?
Light and Heat (thermal)
Define kinetic and potential energy.
Kinetic- moving
Potential- stored/not moving
The magnetic force is strongest at the _________
Poles
Define conductor & insulator.
Conductor- allows electricity to flow
Insulator- slows down or stops the flow of electricity
Define conduction, convection, & radiation.
Conduction- heat by direct contact (touching)
Convection- heat through currents
Radiation- heat by being near (through waves)
Food would be what form of energy?
Chemical
Compare KE and PE in a roller coaster.
Max potential at the peaks and max kinetic when closest to ground. They transform back and forth throughout the entire ride
Explain why objects fall to the ground.
The gravity pulls them down.
Explain conduction, induction, & friction.
Conduction- charge by toughing (same charge)
Induction- charge by being near (opposite charge)
Friction- charge by rubbing (gains electrons)
You touch a hot spoon and burn your hand. What type of heat transfer is this?
Conduction
What form of energy would a rubber band have?
Elastic (potential) energy
Graph the relationship between KE and speed.
Miss Reynolds will draw the answer on the board
How can you increase the magnetic field strength of an electromagnet? (3 ways)
More current (batteries), more wire turns, bigger iron core
Predict how the amount of wire turns affect an electromagnet.
More wire turns = stronger electromagnet
How does heat flow? (hot to cold or cold to hot)
hot to cold
Energy transformations in blow drying hair.
Electrical (plug in) to mechanical (turn on) to thermal and sound (blow drying) to mechanical (moving it around your head to dry your hair
Explain how PE & KE change in a pendulum.
Max PE at the top, changes to KE, max KE at the bottom, changes to PE, max PE at the top again
How are your weight and mass affected when you go to the moon?
Your weight changes but mass does not because weight depends on gravity while mass does not
Repel, attract
In currents, heat ________ and cool _______.
rises, falls
Identify the energy transformations in lighting a candle with a match.
Match- chemical (maybe sound from striking) to light and thermal
Candle- chemical to light and thermal (maybe sound from crackling)
Graph the relationship between PE and height.
Miss Reynolds will draw the answer on the board
How is an electromagnet created?
Current-carrying wire wrapped around an iron core connected to a battery. The electric field lines up the domains in the iron core making it have a magnetic field.
Describe the difference between generators and motors.
Generators uses mechanical energy to produce electrical energy.
Motors use electrical energy to produce mechanical energy
How does conduction, convection and radiation apply to a pot of boiling water?
Conduction- pot sitting on stove
Convection- currents in the water
Radiation- feeling the heat come off of the pot when being near it