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# Ms. Tinkham's CH 6

### energy, work, power, simple machines

What is energy? The ability to move or change matter.
What is potential energy? The energy of position.
What is kinetic energy? The energy of motion.
What does the law of conservation of energy state? Energy is neither created or destroyed.
What is renewable energy? Energy that is always available.
What is an example of renewable energy? Wind, radiant.
What is non-renewable energy? Energy that cannot be re-used.
What is an example of non-renewable energy? Fossil fuels.
What kind of energy do we get from food? Chemical energy.
What kind of energy do we usually get from friction? Thermal energy.
What is work? The form of energy that comes from force applied over a distance.
What is the formula for work? W=Fd
What is the unit of measure for work? A joule.
What is power? The rate at which work is done.
What is the formula for power? P=W/t
What is the unit of measure for power? A watt.
What is a machine? A device with moving parts that work together to accomplish a task.
What is a simple machine? An unpowered mechanical device that accomplishes a task with only 1 movement.
Name 5 simple machines. Wheel and axle, rope and pulley, ramp, lever, gear.
How many classes of levers are there? Three.
Describe a 1st class lever. Fulcrum is between input and output forces.
Describe a 2nd class lever. Fulcrum is at one end, input force is at the other end, and the output force is in the middle.
Describe a 3rd class lever. Fulcrum is at one end, output force is at the other end, and the input force is in the middle.
What are 2 simple machines you use in your home to make your life easier? Stairs, knife. etc.
What is meant by “mechanical advantage?” The ratio of output force divided by the input force.
Created by: Ms. Tinkham
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