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# LESSON NO

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```									                         Mechanics
26 Lessons.

An understanding of the principles in this unit and in the general
requirements is expected in familiar and unfamiliar situations. In
examination questions where the context is beyond the content of the
specification it will be fully described.
LESSON CONTENT               RESOURCES
LESSON NO: 1 - 4                 TOPIC: Rectilinear motion                 1-3
SYLLABUS STATEMENT                               Measure speed and            Light gates, timers / data
1.1 Distance, displacement,      1-3                                       acceleration of trolley on   logging computers, trolleys,
speed, velocity and          Experimental study of uniformly           ramp using light gates       ramps or use the
acceleration.                accelerated motion, based on laboratory   (this will have been         ultrasound motion sensor.
Equations for uniformly      measurements of displacement and          covered at GCSE, but it      ICT: P19: Weblinks: ‘Linear
accelerated motion in one    speed.                                    will act as a good warm      motion’
dimension.                   v = u + at                                up exercise).                ICT: P19: Info sheet
x = ut + ½at2                                                          ‘Kinematics’
v2= u2+ 2ax                               Read pages 32 and 33         ICT: P19: Labmouse:
‘distance, displacement,     ‘Kinematics’
speed, velocity and          WS ‘Kinematic equation.
acceleration’.               ICT: Datalogging: ’Ball toss’
Questions (page 42) 2,3.     ICT: Datalogging:
‘Determining g on an
incline’
Derive the equations of      ICT: Projector: Simulations:
motion.                      acceleration.
Read pages 36 and 37         ICT: Projector: Simulations:
4                                         ‘Equations of motion’        ‘The bouncing ball’ (for
Measurement of the acceleration of free   Questions (page 42) 7,9.     resistance free motion)
fall. A method involving a body in free   4                            ICT: Projector: Simulations:
fall is expected.                         Revise ideas about free      ‘Mechanics – motion with
fall from GCSE. Read         constant acceleration’
pages 38 and 39 ‘
Vertical motion under
gravity / terminal
velocity’.

Measure acceleration of
a body in free fall to
measure g.                   EXPT ‘Measuring g’
ICT: Datalogging: ‘Air
Free-fall apparatus is       resistance’
students could use light
gates, ticker timer or a
stopclock and
kinematics.
LESSON NO: 5 - 8                    TOPIC: Rectilinear motion                    LESSON CONTENT                           RESOURCES
SYLLABUS STATEMENT                                  5+6
5+6                                          This section has again been quite well
1.2   Displacement-time and         Identify and use the physical quantities     covered at GCSE, you may wish to           Note: Phillip Harris
velocity – time graphs and    derived from the gradient and area of        progress to the experiment quite quickly   ticker timers need
carbon backed ticker
their interpretation, for     velocity – time graphs and the gradient of   (and perhaps maintain a group of less      tape.
motion with uniform and       displacement – time graphs.                  able students working on theory.)
non- – uniform                                                             There is an excellent ICT simulation
acceleration.                                                              for displacement and velocity time
graphs.

Read pages 34 + 35.                         Ramp, trolley, ticker
Questions (page 42) 4, 5, 6 and 8.          timer OR
ICT: Ultrasound motion
Record motion of a trolley on a ramp        sensor to produce x/t
using a ticker timer / motion sensor and    and v/t graphs.
convert into a displacement-time and
velocity-time graph. The max speed,
initial acceleration, distance-travelled
etc. can then be calculated.

1.3   Projectiles                   7+8                                          7+8
The independence of vertical and             There are two good ICT demos               ICT: Video camera
horizontal motion should be understood.      covering this topic.                        ICT: Projector:
Numerical problems will involve either                                                   simulations: launch
vertical or horizontal projection.           A prebulit-launching device can be          angle
used to project 2 ball bearings, one
vertically downward and the other with      launching device.
a horizontal velocity.                      ICT: Projector:
simulations: ‘Projectile
If possible the motion of falling objects   motion’
with and without horizontal velocity can    ICT: Projector:
be filmed.                                  Simulations: ‘Rocket’
Questions (page 42) 10 and 11.
LESSON NO: 9 - 12                 TOPIC: Forces and motion                      LESSON CONTENT                        RESOURCES
SYLLABUS STATEMENT                                    9
9                                             Much of this can be covered with a    OHT ‘Basic forces’
1.4 Forces interpreted as a       Familiarity with gravitational, electric,     reading homework:
push or a pull and identified magnetic and nuclear forces; normal and       Read pages 16 to 21 (not the          WS ‘Understanding forces’
as the push or pull of A on   frictional contact forces; viscous and drag   passages on pressure or lift). Read
B.                            forces; tension.                              page 24 on friction.
Questions (page 25) 1,2,3 and 4.
The gravitational pull of the Earth (or
Moon, etc.) on an object.                    *Students can estimate and then
Weight = mg                                  measure the weight of familiar        Variety of common objects
objects.                              found in the lab. Newton
meters.

ICT: Projector: Simulations:
10                                           10                                    ‘Buoyforce’
1.5 Free-body force diagrams.      Use of free-body force diagrams to           Read pages 22 and 23.                 ICT: P19: Weblinks:
represent forces on a particle or on an      The worksheet ‘Free-body force        ‘Resultant forces’
extended but rigid body. Centre of           diagrams’ provides practice that is   WS ‘Free-body force
gravity.                                     lacking in the book.                  diagrams’
*Find the centre of gravity of an     ICT:Info sheet: ‘Vectors and
irregular object.                     forces’
Read page 29 on the centre of         EXPT ‘finding the centre of
gravity.                              gravity of an irregular object’
11 + 12                               ICT:P19: Weblinks: ‘Force’
11 + 12                                      There are several good ICT
1.6 Newton’s first law.            Bodies in equilibrium. Vector forces on      resources for use here.               ICT: P19: Labmouse:
body sum to zero.                            Read pages 44 and 45 (not inertia).   ‘Scalars and vectors’
OHT ‘Newton’s first law’
*The ‘three force equilibrium’        EXPT ‘Three force
experiment should be set up before    equilibrium’
class and results taken as a whole    WS ‘Bodies in equilibrium’
group. It can be very time            ICT: Projector: Simulations:
consuming and complex if done in      ‘Equilibrium’
pairs.                                ICT: Projector: Simulations:
‘Incplane’
The worksheet ‘Bodies in              ICT: Projector: Simulations:
equilibrium’ provides questions       ’Resultant forces’
lacking in the text.
LESSON NO: 13 - 15             TOPIC: Forces and motion                      LESSON CONTENT                    RESOURCES
SYLLABUS STATEMENT                                   13
13                                            This topic has been covered at    4 x OHTs ‘Newton’s
1.7 Newton’s third law.        Force pairs. A statement that the push or     GCSE and hence may be mostly      third law’
pull of A on B is always equal and            covered with a reading
opposite to the push or pull of B on A.       homework:

Question (page 59) 7.

There are a few fun experiments   EXPT ‘Force pairs
that can be tried.                experiments’

14 + 15                                     14 + 15                           ICT: P19: Weblinks:
1.8 Moment of a force.           Moment of F about O =                       Note moments and the principle    ‘Moments’
F x (perpendicular distance from F to O).   of moments is now only in Key     ICT: P19: Infosheet:
stage 3!. It may have been some   ‘Moments’
Principle of moments.        For a rigid body in equilibrium, sum of     time since the students have      ICT: Projector:
clockwise moments about any point =         used these concepts.              Simulations: ‘Lever’
sum of anticlockwise moments about that
point.                                      *Principle of moments
Problems will only be set involving sets    experiment.
of parallel forces.
There is a good ICT simulation   EXPT ‘Principle of
on this topic.                    moments’

Questions (page 21) 1 to 8.       ICT Physim4:
mechanics: lever
There are two good worksheets     principle.
on this topic.

WS ‘Just a moment’
WS ‘Harder
moments’
LESSON NO: 16 + 17          TOPIC: Forces and motion                                  LESSON CONTENT                       RESOURCES
SYLLABUS STATEMENT                                               16 + 17
16                                                        The students may not have            Polystyrene and
1.9 Density.                Typical values for solids, liquids and                    come across the concept of           metal blocks of the
gases. Measurement of the density of                      density previously.                  same mass.
solids, liquids and gases is expected.                    Introduce with polystyrene and
Application of  = m/V                                    metal blocks of the same mass.
Question (page 295) 9.               EXPT ’Measuring
Students measure density of          the density of air’
solids, liquids and air (see expt    WS ‘Density’
details.
Density worksheet.
*Students find out the densities
of the Earth, the sun and an
atomic nucleus.                      Bottle of mercury.
Students feel mass of a bottle of
mercury (SAFETY : ‘Ensure that
it is lifted only a small distance
above a tray)

LESSON NO: 18 - 20              TOPIC: Dynamics
SYLLABUS STATEMENT                              LESSON CONTENT                       RESOURCES
18 - 20                                  18 - 20                              OHT ‘Momentum’
1.10 Linear momentum.        Defined as p = mv
Principle of the         Experimental study of conservation of                                        ‘Momentum’
conservation of linear   linear momentum for collisions in one   Read page 46 for linear              ICT: P19: Info
momentum                 dimension only.                         momentum.                            sheet: ‘Momentum’
Question (page 58) 2.
Read pages 54 and 55 for             ICT: Projector:
conservation of momentum,            Simulations:’Collisio
Question (page 59) 14, 15, 16,       ns’
17 and 18.                           ICT: Projector:
Simulations:'Mecha
nics: elastic and
inelastic collisions’

*Experiment / demo collisions on     EXPT ‘Air track
air track to investigate principle   collisions’
of conservation of momentum.         ICT: Datalogging:
‘Momentum,
Measure speed of pellet from air     energy’.
rifle.                               EXPT ‘Speed of
pellet’
LESSON NO: 19 - 26            TOPIC: Dynamics                                 LESSON CONTENT                        RESOURCES
SYLLABUS STATEMENT                                     19 + 20
19 + 20                                         Read pages 52 and 53.                 EXPT? collision
1.11 Newton’s second law.     Force and rate of change of momentum.           Questions (page 59) 11, 12 and        with timer???
Resultant force as rate of change of            13.
momentum F = p/t                                                                    OHT ‘Momentum
Calculations will only be set in situations                                           and impulse’
where mass is constant.
Impulse = change of momentum.                                                         ICT: P19: Infosheet
‘ Newton’s law’
ICT : Datalogging:
‘Impulse and
momentum’
ICT: Projector:
Simulations:'n2law’
ICT: Projector:
simulations:
21, 22 and 23                               21, 22 and 23
1.12 Acceleration, mass and       Applications of F = ma                     Investigation
force.                       Experimental investigation of uniformly     *Students investigate the
accelerated motion where mass is            relationship between F, m and a       EXPT ‘Newton’s
constant.                                   using air tracks or friction          second law’
compensated motion ramps and          OHT ‘Newton’s
light gates.                          second law’
24
Revise for test (see revision questions).   Read pages 46 and 47.
Questions (page 58) 1, 3, 4, 5,
9, 10 (a + c), 11, 13.
25
Mechanics test                              Read pages 56 and 57 on car
safety.

26                                          Revision Questions: Page 104:
Go through test.                            7, 7(a), 9, 10, 11, 12, 13, 15, 16,
17, 18, 19, 20, 21, 22, 23, 24,
25, 26, 27, 28, 29, 30, 31, 32,
33, 34, 35.

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