9 to 5
Force acting through a parallel distance moved
What is mechanical work?
Rate at which work is done?
What is Power?
Energy of Motion
What is Kinetic Energy?
principle used when TME stays constant
What is Conservation of Energy?
When a force is applied in a direction perpendicular (90 degrees) to the direction of motion.
What is no work is done?
The formula used to calculate Power
What is P = W/t (power equals work over time)?
Any energy based on position.
Potential Energy
The standard equation used for Conservation of Mechanical Energy?
What is KEi + PEi + Wext = KEf + PEf
This changes whenever work is done on or by an object.
What is Energy?
What is P = F*v
The energy due to the height above a reference position.
What is gravitational potential energy (PEgrav)
Term you get to ignore when there's no friction or air resistance.
What is external work
The amount of work done by gravity on a cat sleeping on a shelf.
What is 0 J?
Power exerted by a weightlifter to lift 1000N barbell 2m in 0.5sec
What 4000 watts?
KE + PEgrav + PEspring
What is Total Mechanical Energy (TME)
Equation used for a sled sliding down a frictionless hill from rest at the top and ending along the level ground.
What is PEi = KEf (or mgh = 1/2 mvf2)
The meaning of the + or - sign when applied to work.
What is the energy increases (+) or decreases?
The power exerted to accelerate a 100kg e-bike from zero to 20m/s in 1 sec.
What is 20 000 watts?
(0.5*100kg*(20m/s)^2/1sec)
TME of a 100kg cart moving at 10m/s along a level track 10m above the ground.
What is 15000 J (KE + PE)
(.5*100kg*(10m/s)2 +(100kg*10m/s2*10m))
What is KEi + Wext = 0? or 1/2mvi2 +Ffrictd