Lists
Name the two types of mechanical energy
Kinetic and potential
True/False: Work cannot be done without energy.
True
True / False: Upthrust is the upward force an object in a fluid experiences, and is equal to the weight of the fluid displaced.
True
True / False: Nonrenewable energy sources will not run out, whereas renewable energy will eventually run out.
False
True / False: An effort is the force you need to overcome to move an object.
False
Name two benefits of renewable energy sources
Renewable energy sources produce less carbon dioxide than fossil fuels and won't run out.
The process of changing one form of energy into another.
Energy conversion
If force stays the same but area becomes smaller, what happens to pressure?
It increases.
Where do fossil fuels come from?
Long dead plants and animals
It's a combination of simple machines connected together to accomplish a job
Complex machine
Name two fossil fuels
Coal, natural gas, oil
The energy that depends on an object's weight and height.
Potential energy
The upward force on an object in a fluid; it's what makes things float.
Upthrust
What takes one form and energy and converts it to another?
Machines
The point on which a lever rest, or is supported and on which it pivots.
Fulcrum
Name five types of simple machines
Levers, pulleys, wedges, inclined planes, screws, wheels & axles, gears, hydraulics
The transfer of energy that occurs when a force moves an object.
Work
How do barometers work?
Barometers measure atmospheric pressure through fluid levels. When the air pressure increases, the fluid level rises.
What converts the sun's energy into electricity?
Solar panels
The force that a machine exerts on an object.
Output force (or load)
Name four different types of energy (besides kinetic and potential) and describe them.
Chemical energy is the energy stored in food, fuels and batteries
Heat energy flows from one place to another due to a difference in temperature
Wave energy is the energy associated with wave action
Radiation is the energy in the form of electromagnetic waves or streams of particles
Nuclear energy is the energy stored in the nucleus of an atom
Electrical energy is the energy associated with moving electric charge
What is the Law of the Conservation of Energy?
Energy cannot be created or destroyed; it can only change forms.
What is Archimedes' Principle?
Upthrust is equal to the weight of the fluid displaced.
What are energy sources that exist in limited quantities, such as oil and coal.
Nonrenewable energy sources.
How do you calculate mechanical advantage?
Mechanical Advantage = Load / Effort = Output force / Input force