Forces and Energy Flashcards
Name all energy stores
kinetic thermal chemical gravitational elastic electrostatic magnetic nuclear
what are the four ways energy can be transferred?
mechanically
electrically
heating
radiation
What happens if a force moves an object?
work is done and energy is transferred
how to calculate work done
force * distance moved
what happens when a force is doing work?
rise in temperature as energy is dissipated to thermal energy
how to work out efficiency
useful energy transferred / total energy supplied
what is power?
the rate of energy transferred
what is power measured in?
Watts
how to calculate power
work done / time taken
what is an interaction pair?
when objects feel an equal but opposite force
what does the size of arrows show?
the relative magnitude and directions
what is a resultant force?
overall force on an object at a single point
how to calculate overall effect
add all forces going in same direction and subtract any going in opposite direction
what force do objects in equilibrium have?
resultant force of zero
how to find magnitude
measure length of line (resultant force)
