Properties of Energy
Law of Conservation of Energy
What are the two main categories of energy?
Potential energy and kinetic energy
You touch a hot cup of tea, and your hand gets warm. Is this a transfer or transformation?
Transfer
You charge your phone before using it. What type of energy is stored in the battery?
Electrical potential energy
What is one renewable energy source that produces no greenhouse gases?
Solar, wind, nuclear, etc.
The ability to do work
Energy
Energy stored in the bonds of atoms and molecules
Chemical energy
You and your friends are skateboarding downhill. What kind of energy transformation is this?
Gravitational energy to mechanical energy
Gasoline in a car contains what kind of energy?
Chemical energy
What is the largest contributor to human-caused CO₂ emissions?
Electricity and heat
Energy can cause change in a _________
System
An object resting on the edge of a cliff has what kind of energy?
Gravitational potential energy
When a wind turbine spins, what form of energy is being transformed into electrical energy?
Mechanical energy
You accidentally drop your phone and it hits the floor with a loud thud. What types of energy are present at the moment of impact?
Mechanical energy (just before hitting), sound energy (on impact)
Which human activity both increases carbon emissions and reduces Earth’s ability to absorb carbon dioxide?
Deforestation
When energy moves from one object to another but stays in the same form
Transfer
Define nuclear energy
Energy stored in the nucleus of an atom
When a person eats food and then runs, the ______ energy from the food is transformed into _______ energy.
Chemical, mechanical
Identify the energy transformation when a solar panel powers a home
Radiant energy to electrical energy
What is a major reason some energy projects have faced ethical concerns in Canada?
Some have been built on Indigenous lands without full consent
What are the three different types of systems?
Open, closed, isolated
Kinetic energy
Why are energy transformations never 100% efficient?
Some energy will always be converted into unusable forms, as a byproduct
You're watching a movie on your laptop. List at least three different types of energy involved in this process
Electrical, sound, radiant, thermal
Which country generates almost all its electricity from renewable sources like hydro, wind, and geothermal energy?
Costa Rica