topic 1 - energy Flashcards
what is potential energy?
the maximum power something has to store energy
GPE formula?
GPE = mgh
Gravitational potential energy equation, with units?
Gravitational potential energy (J) = mass (kg) x height (m) x gravitational field strength (N/kg)
Elastic potential energy definition?
Energy stored in an object when its stretched or squashed/when a force is applied
Elastic potential energy formula?
EPE = 1/2kx²
Elastic potential energy, what do k, and x stand for?
k: spring constant (N/m
x: extension (m)
state 2 ways to increase elastic potential energy?
stretching elastic or applying pressure
how to find k (EPE)?
to find k we use: k= force in newtons/extension in m
what are the units for elastic potential energy?
Elastic potential energy is measured in joules
name 3 objects with GPE?
a book on a shelf, lifting a pen, clock on a wall
what is kinetic energy?
kinetic energy = energy gained when something moves
anything moving = ??
anything moving = kinetic energy
explain why identical objects at the same height would have different gpe’s on different planets?
because diff planets = diff gravitational field strength which effects its gpe
KE= ??
KE= 1/2 mv²
units for kinetic energy formula?
KE= J, mass = kg, velocity = m/s
formula for kinetic energy, with units?
Kinetic energy (J) = 1/2 x mass (kg) x velocity² (m/s) only velocity is squared
when something starts to move it gains ______, this is called _____?
when something starts to move it gains energy, this is called kinetic energy
work done = f x ??
work done = force x distance
equation for work done, with units?
Work done (J) = force (newtons) x distance (metres)
what is “work done” measured in?
work done is measured in Joules (J)
what is meant by “work done”?
work done= energy transferred per second by moving an object
unit for power?
power = Watts (W)
equation for power, with units?
Power (W) = work done (J)/ time taken (s)
distance equation?
distance = work done/force
