Energy transfer Flashcards
what is the principle of conservation of energy
Energy can not be crated or destroyed but only converted from one form to another
what is the unit of energy
the Joule
what is the equation for change in GPE
change in GPE = mass x gravitational field strength x change in height
how do you work out the weight
W = m x g
how do you work out efficiency
efficiency = final GPE/ initial GPE
what is the equation for KE
KE = 1/2mv^2 V = square root (2KE/m)
what is kinetic energy
it is the energy associated by a moving object
why might a tennis ball be less efficient in bouncing than a bouncy ball
the material for the tennis ball may have caused more heat loss as the ball falls through the air
why might the efficiency increase when dropping a ball at lower heights
the ball is falling more slowly and through less air so there is less heat energy being lost
Definition for work
Energy has been transferred by a force
What is work the same as
Energy transferred
What is the equation for work
Work = force x distance moved in direction of force
What is the equation for power
Power = work done or energy transferred/ time
= (f x d)/ time
What is power
The rate at which work is done or the rate at which energy is transferred
What is the equation for efficiency
Efficiency = useful output/ total input x 100
