Exam-style questions
Core
1 Two identical ropes are attached to either end of a beam of weight 600 N.
a Calculate the tension (force), T, in each rope when they support the beam horizontally above
the ground.
T = ..............................
[1]
b Calculate the work done if the beam is raised vertically by 1.5 m.
work done = ..............................
[2]
c Calculate the power needed to raise the beam 1.5 m in 3 seconds.
power = ..............................
[2]
[Total: 5]
2 Give two advantages and two disadvantages of using the following as sources of energy for
electricity generation.
a solar energy
i
advantages: .........................................................................................................
......................................................................................................................... [2]
ii disadvantages: .....................................................................................................
......................................................................................................................... [2]
1C Energy, work, power and pressure
b nuclear energy
i
advantages: .........................................................................................................
......................................................................................................................... [2]
ii disadvantages: .....................................................................................................
......................................................................................................................... [2]
c wind energy
i
advantages: .........................................................................................................
......................................................................................................................... [2]
ii disadvantages: .....................................................................................................
......................................................................................................................... [2]
d gas-fired power stations
i
advantages: .........................................................................................................
......................................................................................................................... [2]
ii disadvantages: .....................................................................................................
......................................................................................................................... [2]
[Total: 16]
Supplement
3 a A cyclist freewheels (without pedalling) from rest down a hill. Explain the energy transfers
which occur during her descent.
.............................................................................................................................
.............................................................................................................................
.............................................................................................................................
......................................................................................................................... [3]
b On reaching level ground the cyclist pedals along a straight road with a constant speed of
12 m/s. She experiences a resistive force, F, of 5 N, which acts in the opposite direction to that
in which she is travelling. Calculate the work she does against F in 1 second.
work done = ..............................
[2]
1C ENERGY, WORK, POWER AND PRESSURE
c F then increases to 7.5 N. Calculate the cyclist’s new speed, if she maintains the same rate
of working as in part b.
i
rate of working = ..............................
ii speed = ..............................
[1]
[2]
[Total: 8]
4 A ball of mass 60 g is projected vertically upwards from ground level with an initial velocity of
30 m/s. Neglect the effect of air resistance on the motion of the ball. Determine:
a the initial kinetic energy of the ball
initial Ek = ..............................
[3]
b the initial potential energy of the ball
initial Ep = ..............................
[1]
c the potential energy of the ball when it reaches its greatest height
Ep at greatest height = ...............................
[1]
d the greatest height reached by the ball.
greatest height = ..............................
[Total: 7]
[2]