Quiz 4b (12.04.2020) Flashcards
stored energy held in readiness with a potential for doing work
potential energy
what is gravitational potential energy?
potential energy due to elevated position
gravitational potential energy is equal to the ____
work done (force required to move it upward times the vertical distance moved against gravity) in lifting it
in equation form, potential energy equals___
mass x acceleration due to gravity x height
energy of motion
kinetic energy
if object speed is doubled, kinetic energy is ___
quadrupled
kinetic energy equals ___
1/2 mass times velocity squared
kinetic energy is equal to the ___
work required to bring it from rest to that speed, or the work the object can do while being brought to rest
law of conservation of energy
energy cannot be created or destroyed; it may be transformed from one form into another, but the total amount of energy never changes
similarities between momentum and kinetic energy
both are properties of moving tings
difference between momentum and kinetic energy
momentum is a vector quantity and therefore is directional and can be canceled, kinetic energy is a scalar quantity and can never be canceled
what is a machine?
device for multiplying forces or changing the direction of forces
machines cannot ___ but can ___
create energy; transform energy from one form to another, or transfer energy from one location to another
work input equals
work output
input force x input distance =
output force times output distance
