Energy Test Flashcards
is a spring, compressed or stretched, Kinetic or Potential Energy?
POTENTIAL ENERGY
is the breeze that hits you when a car drives by Kinetic or Potential Energy?
KINETIC ENERGY
what type of energy is friction?
THERMAL ENERGY
what is POWER
Joules per second
what is WORK
a change in energy
what is a Watt? (400 watts = )
Joules per second (400 Watts = 400 J/s)
what does kinetic plus potential energy (plus thermal energy) equal?
Mechanical Energy / Total Energy
what type of energy is waving your hand?
mechanical
(it moves like a pendulum, metronome)
what type of energy is a car accelerating?
kinetic
what type of energy never changes on a skateboarder’s route?
TOTAL ENERGY
what is the law of conservation of energy?
energy can not be created or destroyed, only transformed
what is a Joule?
enough energy to push with a force of one newton for one meter
what UNITS must energy measurements ALWAYS be in?
Energy: JOULE
Mass: KILOGRAM
Height: METERS
Velocity: METERS/SEC
what does friction/thermal energy do?
eats up energy
when going down a ramp, PE will be greater at top than KE at bottom
when going up a ramp, KE will be greater at bottom than PE at top
if different-shaped slides are frictionless, how will the speeds compare?
all be the same speed! (same height, PE at top will equal KE at bottom!)
