P1 Flashcards
what is a closed circuit
no energy transfers like the conservation of energy
-The pendulum experiment in a vacuum
what is the equation for gravitational potential energy
mass x Gravitational field strength x height
Kg x N/kg x m
what is the equation for kinetic energy?
0.5 x mass x speed^2
0.5 x kg x m/s^2
what is the equation for elastic potential energy
0.5 x spring constant (K) x extention^2
0.5 x N/m x m^2
what is useful every
energy transferred to where it is wanted in the way it is wanted
what is wasted every
Energy that is not usefully transferred
what does dissipated energy mean
The rest of the energy that is not usefully transferred gets dissipated or spreads out.
this is called wasted energy because it is not transferred as useful energy
what are ways that energy spreads out
-wasted energy is dissipated spread out to the surroundings
-useful energy is eventually transferred to the surroundings too
-Energy becomes less useful the more it spreads out
what is the equation for efficiency?
useful power output , J
————————————-
total power input ,J
what is the input energy equation?
input energy = useful output energy +energy wasted
J
why can you not get 100% efficiency?
because u can never get more energy from a machine than you put into it
how to reduce wasted energy caused by friction
luvricarion
how to reduce wasted energy from a wire when it gets too hot
use wires with as little electrical resistance as possible
how to reduce energy wasted from resistance
streamline the shapes of moving objects to reduce air resistance
how to reduce wasted energy from sound
Cut out noise
titan loose parts to reduce vibration
what is the equation for power?
P= Work done W
—————
Time T
