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Fair Physics
Review of motion and energy
Question | Answer |
---|---|
distance divided by time | speed (s) |
SI units for distance (length) | meters (m) |
SI units for time | seconds (s) |
energy based on position | potential (PE) |
energy based on velocity | kinetic (KE) |
energy that is the sum of PE and KE | mechanical (ME) |
SI units for energy | joules (J) |
Ways to be accelerating | speed up , slow down , change direction |
object is moving at constant speed in a circular path | centripetal acceleration |
object is in this state if falling and gravity is only force acting on it | free fall |
system where no new energy enters and no existing energy leaves (conserved) | closed |
system where energy can enter and leave (not conserved) | open |
has a value of 10 m/s^2 in the downward direction on Earth | gravity |
formula for PE | mgh |
formula for KE | 1/2m x v^2 |
amount of matter and object has | mass |
speed with a direction | velocity |
SI units for mass | kilograms (kg) |