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
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
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)
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
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)
make calculations of the energy transfers associated with changes in a system, recalling relevant equations for mechanical processes
calculate relevant values of stored energy and energy transfers; convert between newton-metres and joules
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
explain, with reference to examples, the definition of power as the rate at which energy is transferred (work done) in a system
recall and apply the relationship:
power (W) = energy transferred (J) ÷ time (s)