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Ms. Tinkham's CH 6
energy, work, power, simple machines
Question | Answer |
---|---|
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. |