P1 Flashcards
Name the 8 types of energy :
thermal energy, radiant energy, chemical energy, nuclear energy, electrical energy, motion energy, sound energy, elastic energy and gravitational energy.
Energy transfer diagrams :
energy in
then draw out the energy that is useless e.g - light bulb - heat energy is useless
then draw out the usefull bit
conservation of energy :
total energy of an isolated system remains constant - conserved over time
energy changes in a pendulum :
Beginning at position A, the pendulum fob is not moving. It has some energy because of its height (h) – called gravitational potential energy. When it is allowed to swing, that energy is gradually converted to energy of motion – kinetic energy.
Define dissipation :
dissipative process, energy transforms from an initial form to a final form, where the capacity of the final form to do mechanical work is less than that of the initial form.
work done ?:
Work = Force × Distance.
force
and distance equations ?
force equation = Force (N) = mass (kg) × acceleration (m/s²).
distance =
energy transfer diagram
chemical
energy —- electrical —bulb —
stored in energy gives out
a cell light energy
+ thermal energy
gravitational potential energy :
GPE = mass x gravity x height.
kinetic energy calculation
kinetic energy = half mass and
velocity squared
mass formula :
mass=density×volume
5 examples of objects that can store elastic potential energy
The coil spring of a wind-up clock.
An archer’s stretched bow.
A bent diving board, just before a divers jump.
The twisted rubber band which powers a toy airplane.
A bouncy ball, compressed at the moment it bounces off a brick wall.
hows elastic potential energy stored and released
Elastic energy is stored in the bonds between the atoms
absorbs energy when it is compressed, then releases it when it springs back out.
equation for calculating elastic potential energy
Elastic potential energy = force x distance of displacement.
extension formula :
= force
———
spring
constant
