When does Newton's cradle have the most potential energy?
halfway in its upward swing
at rest
halfway in its downward swing
when it is initially pulled back
True or False: Energy conversions are always 100% efficient.
False
Why do incandescent (old fashion) light bulbs require more energy than LED (modern) light bulbs?
more energy is converted to thermal instead of radiant
they are larger than LED
they use a 3-prong plug
more energy is converted to radiant instead of thermal
Why don't bouncy balls return to their starting height when dropped without an applied force?
the inertia is greater than the starting potential energy
gravity becomes stronger near the ground
it should, but doesn't because gravity is acting on the ball
friction converts kinetic energy into thermal energy
What kind of resources are coal, water, and wood?
natural resources
man-made resources
non-renewable resources
renewable resources
True or False: A downfall to nonrenewable resources is that they can take as long as 10 years to replenish.
False
True or False: Fossil fuels are made from the fossils of dinosaurs and prehistoric plants.
False
Which of the following are needed to create fossil fuels?
heat, volume, millions of years
cold, pressure, thousands of years
heat, pressure, millions of years
heat, pressure, hundreds of years
How could electromagnetic induction be produced? (2 options)
by rotating either the metal wire or magnetic field together
none of the above
with electricity being applied to a magnet
with a changing magnetic field surrounded by plastic wires
What is the difference in electricity generation between solar panels and power plants like wind, coal, and nuclear?
Coal, wind, and nuclear are cleaner than solar.
Solar is non-renewable, while coal, wind, and nuclear are.
Solar panels don't use electromagnetic induction.
Solar panels produce more harmful radiation than the others.
Why do most power plants use turbines to generate electricity?
to stoke the coal fire needed to generate electricity
to create excessive amounts of static electricity
to make the mechanical motion for electromagnetic induction
to put heliostats in position to generate more electricity
Why is it important for battery technology to improve within the alternative energy field?
to store energy for when energy availability is lacking
they'll explode if overused
to clean the electricity from coal power plants
to make electricity needed for windmills and solar to work
According to the law of conservation of energy, what is the 1st energy conversion that takes place when fossil fuels are used to generate electricity?
look directly into the sun
mechanical energy transforms into electrical energy
thermal energy transforms into mechanical energy
stored chemical energy transforms into thermal energy
According to the law of conservation of energy, what is the 2nd energy conversion that takes place when fossil fuels are used to generate electricity?
touching fire with your bare hands
thermal energy transforms into mechanical energy
stored chemical energy transforms into thermal energy
mechanical energy transforms into electrical energy
According to the law of conservation of energy, what is the 3rd energy conversion that takes place when fossil fuels are used to generate electricity?
mechanical energy transforms into electrical energy
thermal energy transforms into mechanical energy
getting struck by lightning
stored chemical energy transforms into thermal energy
How do solar thermal power plants generate electricity?
heliostats direct light energy to turn water into steam
PV cells absorb thermal energy and convert it to electrical
heliostats direct thermal energy to turn water into steam
PV cells absorb light energy and convert it to electrical
