The vertical displacement of a mass of $$\(0.20 \mathrm{~kg}\)$$ changes with time. The graph shows how this displacement changes. At which rate does it gain gravitational potential energy as it moves upwards?

1.7.1.1 State that energy may be stored as kinetic, gravitational potential, chemical, elastic (strain), nuclear, electrostatic and internal (thermal)

1.7.1.2 Describe how energy is transferred between stores during events and processes, including examples of transfer by forces (mechanical work done), electrical currents (electrical work done), heating, and by electromagnetic, sound and other waves

1.7.1.3 Know the principle of the conservation of energy and apply this principle to simple examples including the interpretation of simple flow diagrams

1.7.1.4 Recall and use the equation for kinetic energy Ek = 1/2mv2

1.7.1.5 Recall and use the equation for the change in gravitational potential energy ΔEp = mgΔh

1.7.1.6 Know the principle of the conservation of energy and apply this principle to complex examples involving multiple stages, including the interpretation of Sankey diagrams

1.7.2.1 Understand that mechanical or electrical work done is equal to the energy transferred

1.7.2.1.1 chemical energy stored in fuel

1.7.2.1.2 water, including the energy stored in waves, in tides, and in water behind hydroelectric dams

1.7.2.1.3 geothermal resources

1.7.2.1.4 nuclear fission

1.7.2.1.5 heat and light from the Sun (solar cells and panels)

1.7.2.1.6 wind

1.7.2.2 Recall and use the equation for mechanical working W = Fd = ΔE

1.7.3.2 Describe advantages and disadvantages of each method in terms of renewability, availability, reliability, scale and environmental impact

1.7.3.3 Understand, qualitatively, the concept of efficiency of energy transfer

1.7.3.3 (old) Recall and use W=Fd=∆E

1.7.3.4 Know that radiation from the Sun is the main source of energy for all our energy resources except geothermal, nuclear and tidal

1.7.3.5 Know that energy is released by nuclear fusion in the Sun

1.7.3.6 Know that research is being carried out to investigate how energy released by nuclear fusion can be used to produce electrical energy on a large scale 1.7.3.7 Define efficiency as: (a) (%) efficiency = (useful energy output) / (total energy input) × 100% (b) (%) efficiency = (useful power output) / (total power input) × 100% recall and use these equations

1.7.4.1 Define power as work done per unit time and also as energy transferred per unit time; recall and use the equations (a) P = W/t (b) P = ΔE/t

1.7.4.2 (old)Recall and use the equation P =∆E / t in simple systems