Electricity is used to pump water from the lower reservoir to the upper reservoir. When the water
flows back down, its kinetic energy store is used to generate electricity.
Describe the benefits and risks of replacing fossil fuel power stations with wind farms and solar
panels and explain how pumped storage systems can help to reduce the risks.
, 4
2
(a) A student is investigating the motion of a trolley travelling down a ramp, using the equipment
shown in Fig. 2.1.
Fig. 2.1
Trolley
Ramp
Describe how the student can use a metre ruler and a stopwatch to find out the average speed of
the trolley down the ramp.
distance
Use the idea that average speed =
time
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