yr 10 science test 2
What is kinetic energy
kinetic energy is energy stored in moving objects
what must kinetic energy have
mass (m) and speed (v)
what is potential energy
energy that is stored in an object due to its postition
what happens when kinetic energy is lost
it will equal the potential energy gained
what happens when potential energy is lost
it will equal the kinetic energy gained
what is work and an example
whenever work is done energy is transferred ex. walking up stairs
what is weight
the force of gravity acting on a mass
what is work measured in
Joules (j)
what is newtons first law
an object remains in a constant state of motion unless acted on by and external unbalanced force
What is newtons second law
when an object expericences an unbalanced external force, it will undergo acceleteration ( a change in velocity) depandant on the mass of the object and the size of the force
what is newtons third law
for every force applied on a mass, the mass exerts an equal but opposite reaction force
what are the 5 types of energy
kientic, potential,electrical, light and sound
what are the 4 types of potential energy
gravitational, elastic, kinetic, chemical
what is gravitational potential energy
the energy aquired by an object due to a change in it's position when it is present in a gravitional field
what is elastic potetional energy
energy started as a result of applying a force to deform an elastic object
what is chemical potential energy
energy stored in the bonds of atoms and molecules
what is kinetic potential energy
energy that a moving object has due to its motion is kinetic energy
what is eletrical energy
the movement of an electrical charge and is the result of the interaction of subatomic particles
what is light energy
is an electromagnetic radiation of a particular wave length that is visible to the human eye
what is sound energy
it is the energy produced by sound vibrations which cause waves of pressure
what is the law conservation of energy
energy cant be created or destroyed only transformed
what is energy transformation
an energy transformation is the change of energy from one form to another
example of an energy tranformation
heat energy to kinetic energy
what is the efficency of energy transformations
the ratio between the useful output of an energy conversion machine and the input in energy terms
what is force
force is a push or pull extered on one object by another
what is acceleration and an example
the rate of change of velocity(speed) in a object
walking down the street
what is net force
the effect of all the pushing a pulling forces