Classifying energy
Define energy
the ability to do work
Define nonrenewable resources
an energy resource that cannot be naturally replaced within a person's lifetime.
Why do we sometimes think energy has been lost?
It was transferred either to another object or another type.
benefits-doesn't create air pollution
drawbacks-produces unsafe nuclear waste
what two things can energy be converted into
it can be converted from one kind to another or it can be transferred to another object
What is the law of conservation of energy?
The total energy within a closed system remains constant over time.
Define renewable resource
a resource easily replaced by natural methods
What type of energy is the sum of all the forms of energy in the system?
Mechanical energy.
fossil fuels
benefits-reliable and easy to use/acquire
drawbacks-pollutes air easily
what is the energy of motion
kinetic energy
How are kinetic energy and potential energy related?
Kinetic energy is the energy possessed due to motion, and potential energy is the stored energy of an object due to its position. They both add up to give you the mechanical energy.
what are fossil fuels
a nonrenewable resource made from dead plants and animals
Why are energy transformations important to us?
Because we can convert energy into different forms that better suit our needs.
geothermal energy
benefits-clean, renewable, reliable, and natural
drawbacks-geothermal plants are expensive and can cause earthquakes
give three examples of fossil fuels
coal, oil, natural gas
Name the different forms of potential energy.
Elastic, chemical, and gravitational.
what is nuclear energy
a renewable resource that comes from nuclear fission reactions
What are some examples of energy transformations?
Wind turbines converting wind to electricity, solar panels converting solar energy to electricity, and hydroelectric dams converting kinetic energy to electricity.
benefits- easily produced in abundance
drawbacks- regulated by uncertain water patterns/not dependable
what type of energy comes from fission of radioactive elements
nuclear energy
Using the gravitational potential energy formula, GPE=mgh, calculate the gravitational potential energy of a 1kg hammer sitting on a 4m high shelf.
GPE=39.24j
What is solar energy
a renewable resource that comes from sunlight
How is energy conserved?
It can be transferred to other objects or transformed into other forms of energy.
wind energy
benefits- intermittent, causes noise and visual pollution, uncertain
how can christians use this chapter to fulfill the creation mandate
by conserving energy and helping to find new energy sources