1B.1 Gravitational potential and Kinetic energies Flashcards
Gravitational potential energy
is the energy an object has by virtue of its position in a gravitational field
kinetic energy
it is the energy an object has by virtue of its movement
Gravitational potential energy =?
Mass kg x gravity N Kg^-1 x Height m
what us gpe considered
it is changes of gpe caused by the change of height Gpe = Mass kg x gravity N Kg^-1 x (change of )Height m
What is Gravitational potential energy measured in
Joules
what is the gravitational field strength
It is the measure of a pull of gravity by a planet at a distance from its center. this is not a constant value since the strength of the Gravitational field strength experienced by mass is inversely proportional to the square of the distance from the planet’s centre
kinetic energy =
Kinetic energy (J) = 1/2 x m (kg) x speed^2 = (v^2) ( m^2 s^-2)
what is the principle conversation of energy
energy is never lost or gained therefore when transferring from kinetic energy to gravitational potential energy we would have mgh = 1/2 mv^2 dividing by both masses and rearranging we would get v= square root of 2gh and h = v^2/2g
how can we energy be transformed from kinetic energy to gravitational energy
E(g) can be transformed to E(k) if an object falls to a lower height and E(k) can be transformed to E(g) if an object is thrown upwards
following the principle of energy, how can we find how fast an object is traveling after falling from a certain distance
v= square root of g x (change of) height
following the principle of energy, how can we find how high an object could rise if project upwards at a certain speed
(change of) h = v^2/2g
v= square root of g x (change of) height how does this confirm galileo’s theory
it shows that 2 objects from the same height can fall to the ground at the same rate regardless of their mass ( assuming that there isn’t any energy last in friction or air resistance)
