Energy And Motion Test Flashcards
What’s the formula used to find power?
Work/time
What are the SI Units of power and work?
Power = Watts (W) Work = Joules (J)
How do you calculate the IMA of a pulley system?
Count the number of supporting ropes
Why can’t a machine have efficiency greater than 100%?
Friction
How can you determine if work is being done on an object?
The object must be moving in the direction of the force applied to it.
What three factors does a machine change by making easier?
Force, distance and direction
How are work and energy related?
Work is the transfer of energy
Where does the energy stored in fossil fuels come from?
Sun
What type of energy transfer is taking place when coal is burned in a furnace?
Chemical to thermal
The potential energy stored in food is what kind of energy?
Chemical
What does the law of the conservation of energy state?
Energy cannot be created or destroyed
What energy transformation takes place when natural gas is used to heat water?
Chemical to thermal
What is convection? Give an example.
The transfer of heat by the movement of currents within a fluid.
Ocean and wind global currents
What is conduction? Give an example.
The transfer of heat from particle to particle without the movement of matter.
Putting ice on a sprained ankle
What’s the formula used to find work?
Force X distance
