#P4.4.1
describe the energy transfers involved when a system is changed by work done by forces including:
a) to raise an object above ground level
b) to move an object along the line of action of the force
#P4.4.2
recall and apply the relationship to calculate the work done (energy transferred) by a force:
work done (Nm or J) = force (N) × distance (m) (along the line of action of the force)
#P4.4.3
recall the equation and calculate the amount of energy associated with a moving object:
kinetic energy (J) = 0.5 × mass (kg) × (speed (m/s))2
#P4.4.4
recall the equation and calculate the amount of energy associated with an object raised above ground level:
gravitational potential energy (J) = mass (kg) × gravitational field strength (N/kg) × height (m)
#P4.4.5
make calculations of the energy transfers associated with changes in a system, recalling relevant equations for mechanical processes
#P4.4.6
calculate relevant values of stored energy and energy transfers; convert between newton-metres and joules
#P4.4.7
describe all the changes involved in the way energy is stored when a system changes, for common situations: including an object projected upwards or up a slope, a moving object hitting an obstacle, an object being accelerated by a constant force, a vehicle slowing down
#P4.4.8
explain, with reference to examples, the definition of power as the rate at which energy is transferred (work done) in a system
#P4.4.9
recall and apply the relationship:
power (W) = energy transferred (J) ÷ time (s)