Physics (5054)
Work, Energy & Power
HO
1 Coal-fired power stations provide electricity for homes and industry.
A government decides to replace a coal-fired power station with a hydroelectric power station.
Describe how electrical energy may be obtained from the gravitational potential energy of the water
behind a hydroelectric dam.
..................................................................................................................................................
..................................................................................................................................................
..................................................................................................................................................
..................................................................................................................................................
.................................................................................................................................................. [3]
[Total: 3]
2 The diagram shows some masses on a mass hanger attached to an elastic band. The elastic band
is stretched by the masses.
rigid support
elastic band
mass hanger
masses
When the student pulls the mass hanger down, energy is stored in the elastic band as elastic
potential energy.
Describe what happens to this energy store when the student releases the mass hanger and it
moves upwards.
..................................................................................................................................................
.................................................................................................................................................. [2]
[Total: 2]
, 2
3 A power station burns waste materials from farm crops to generate electricity.
State and explain whether this process is renewable.
statement ..................................................................................................................................
explanation ...............................................................................................................................
................................................................................................................................................... [2]
[Total: 2]
Work, Energy & Power
HO
1 Coal-fired power stations provide electricity for homes and industry.
A government decides to replace a coal-fired power station with a hydroelectric power station.
Describe how electrical energy may be obtained from the gravitational potential energy of the water
behind a hydroelectric dam.
..................................................................................................................................................
..................................................................................................................................................
..................................................................................................................................................
..................................................................................................................................................
.................................................................................................................................................. [3]
[Total: 3]
2 The diagram shows some masses on a mass hanger attached to an elastic band. The elastic band
is stretched by the masses.
rigid support
elastic band
mass hanger
masses
When the student pulls the mass hanger down, energy is stored in the elastic band as elastic
potential energy.
Describe what happens to this energy store when the student releases the mass hanger and it
moves upwards.
..................................................................................................................................................
.................................................................................................................................................. [2]
[Total: 2]
, 2
3 A power station burns waste materials from farm crops to generate electricity.
State and explain whether this process is renewable.
statement ..................................................................................................................................
explanation ...............................................................................................................................
................................................................................................................................................... [2]
[Total: 2]
