ocr physics a: mechanics
TRANSCRIPT
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7/29/2019 OCR Physics A: Mechanics
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Physics Department
Long Road Sixth Form College
Name
Teacher
G481: MechanicsLearning outcomes and self-assessment
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G481: Mechanics
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Key words
Apply: use to solve a problem.
Calculate: give a numerical answer, usually with an appropriate unit.
Define: a precise statement is required, or the formula stated with all thesymbols explained.
Derive:mathematically determine from first principles, showing all your working.
Describe: requires you to state in words (using diagrams where appropriate)
what will happen in a given situation. An explanation is not normally required
(often the full explanation is too difficult and beyond the requirements of the
specification).
Estimate: implies a reasoned order of magnitude statement or calculation of the
quantity concerned.
Explain: normally implies that some sort of definition or law should be giventogether with some relevant comment about what will happen. Always try to use
the word 'because'.
Interpret: draw meaning from and ultimately analyse.
Outline: identify general principles, in the right order.
Recall: you need to remember this it may not be given in an exam.
Select: pick the right equation or piece of information from the formula booklet.
Sketch: usually draw a graph no scale is required but the axes should be
labelled, the shape clear and key areas identified.
State: only a concise answer is needed with little or no supporting argument.
Units and measurementsYou should be able to: Confidence
Explain that some physical quantities consist of a
numerical magnitude and a unit
Date:___________
Date:___________Use the named units listed in this booklet
correctly and as appropriate
Date:___________
Date:___________Use correctly the following prefixes and their
symbols to indicate decimal sub-multiples or
multiples of units: pico (p), nano (n), micro (),
milli (m), centi (c), kilo (k), mega (M), giga (G),
tera (T)
Date:___________
Date:___________
Make suitable estimates of physical quantities
included within this booklet
Date:___________
Date:___________
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G481: Mechanics
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Scalars and vectorsNumber
You should be able to: Confidence
1define scalarand vectorquantities and
give examples
Date:___________
Date:___________2
draw and use a vector triangle to
determine the resultant of two coplanar
vectors such as displacement, velocity
and force
Date:___________
Date:___________
3
calculate the resultant of two
perpendicular vectors such as
displacement, velocity and force
Date:___________
Date:___________4
resolve a vector such as displacement,
velocity and force into two
perpendicular components
Date:___________
Date:___________
KinematicsNumber
You should be able to: Confidence
define displacement, instantaneous speed,
average speed, velocity and acceleration
Date:___________
Date:___________
5
select and use the relationships
to solve problems
Date:___________
Date:___________
6
apply graphical methods to
represent displacement, speed, velocity
and acceleration
Date:___________
Date:___________7
determine velocity from the gradient of a
displacement against time graph
Date:___________
Date:___________8
determine displacement from the area
under a velocity against time graph
Date:___________
Date:___________9
determine acceleration from the gradient
of a velocity against time graph
Date:___________
Date:___________
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G481: Mechanics
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Linear motionNumber
You should be able to: Confidence
10
derive the equations of motion for
constant acceleration in a straight linefrom a velocity against time graph
Date:___________
Date:___________
11
Select and use the equations of motion for
constant acceleration in a straight line:
( )
, and
Date:___________
Date:___________
12
apply the equations for constant
acceleration in a straight line, including
the motion ofbodies falling in the Earths
uniform gravitational field without
air resistance
Date:___________
Date:___________
13
explain how experiments carried out
by Galileo overturned Aristotles ideas
of motion
Date:___________
Date:___________14
describe an experiment to determine
the acceleration of free fall g using a
falling body
Date:___________
Date:___________
15
apply the equations of constant
acceleration to describe and explain the
motion of an object due to a uniform
velocity in one direction and a constant
acceleration in a perpendicular direction.
Date:___________
Date:___________
ForceNumber
You should be able to: Confidence
16
Solve problems using the relationship:
( )
appreciating that acceleration and the net
force are always in the same direction
Date:___________
Date:___________
17 define the newton
Date:___________
Date:___________18
apply the equations for constant
acceleration and to analyse the
motion of objects
Date:___________
Date:___________
19
recall that according to the special theory
of relativity, cannot be used for a
particle travelling at very high speeds
because its mass increases
Date:___________
Date:___________
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Non-linear motionNumber
You should be able to: Confidence
20
explain that an object travelling in a fluid
experiences a resistive or a frictional forceknown as drag
Date:___________
Date:___________21
state the factors that affect the magnitude
of the drag force
Date:___________
Date:___________22
determine the acceleration of an object in
the presence of drag
Date:___________
Date:___________23
state that the weight of an object is the
gravitational force acting on the object;
Date:___________
Date:___________
24
select and use the relationship:
( )
Date:___________
Date:___________25
describe the motion of bodies falling in a
uniform gravitational field with drag
Date:___________
Date:___________26 use and explain the term terminal velocity
Date:___________
Date:___________
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EquilibriumNumber
You should be able to: Confidence
27
draw and use a triangle of forces to
represent the equilibrium of three forcesacting at a point in an object
Date:___________
Date:___________28
state that the centre of gravityof an object
is a point where the entire weight of an
object appears to act
Date:___________
Date:___________29
describe a simple experiment to determine
the centre of gravity of an object
Date:___________
Date:___________30
explain that a couple is a pair of forces that
tends to produce rotation only
Date:___________
Date:___________31 define and apply the torque of a couple
Date:___________
Date:___________32 define and apply the moment of force
Date:___________
Date:___________33
explain that both the net force and net
moment on an extended object in
equilibrium is zero
Date:___________
Date:___________34
apply the principle of moments to solve
problems, including the human forearm
Date:___________
Date:___________35
select and use the equation for density:
Date:___________
Date:___________36
select and use the equation for pressure:
where Fis the force normal to the areaA.
Date:___________
Date:___________
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G481: Mechanics
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Car safetyNumber
You should be able to: Confidence
37define thinking distance, braking distance
and stopping distance
Date:___________
Date:___________38
analyse and solve problems using the
terms thinking distance, braking distance
and stopping distance
Date:___________
Date:___________39
describe the factors that affect thinking
distance and braking distance
Date:___________
Date:___________40
describe and explain how air bags, seat
belts and crumple zones in cars reduce
impact forces in accidents
Date:___________
Date:___________41
describe how air bags work, including the
triggering mechanism
Date:___________
Date:___________42
describe how the trilateration technique is
used in GPS (global positioning system)
for cars
Date:___________
Date:___________
Work and conservation of energyNumber
You should be able to: Confidence
43 define work done by a force
Date:___________
Date:___________44 define thejoule
Date:___________
Date:___________45
calculate the work done by a force using
and
Date:___________
Date:___________46
state the principle of conservation
of energy
Date:___________
Date:___________
47
describe examples of energy in different
forms, its conversion and conservation,
and apply the principle of energy
conservation to simple examples
Date:___________
Date:___________
48apply the idea that work done is equal to
the transfer of energy to solve problems
Date:___________
Date:___________
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G481: Mechanics
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Kinetic and potential energiesNumber
You should be able to: Confidence
49
select and apply the equation for kinetic
energy
Date:___________
Date:___________50
apply the definition of work done to derive
the equation for the change in gravitational
potential energy
Date:___________
Date:___________
51
select and apply the equation for the
change in gravitational potential energy
near the Earths surface
Date:___________
Date:___________
52
analyse problems where there is an
exchange between gravitational potential
energy and kinetic energy
Date:___________
Date:___________53
apply the principle of conservation ofenergy to determine the speed of an object
falling in the Earths gravitational field
Date:___________
Date:___________
PowerNumber
You should be able to: Confidence
54 definepoweras the rate of work done
Date:___________
Date:___________55 define the watt
Date:___________
Date:___________56 calculate power when solving problems
Date:___________
Date:___________57
state that the efficiency of a device is
always less than 100% because of
heat losses
Date:___________
Date:___________
58
select and apply the relationship for
efficiency:
Date:___________
Date:___________
59 interpret and construct Sankey diagrams
Date:___________
Date:___________
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G481: Mechanics
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Behaviour of springs and materialsNumber
You should be able to: Confidence
60
describe how deformation is caused by a
force in one dimension and can be tensile
or compressive
Date:___________
Date:___________
61
describe the behaviour of springs and wires
in terms of force, extension, elastic limit,
Hookes law and the force constant (ie
force per unit extension or compression)
Date:___________
Date:___________
62
select and apply the equation ,
where kis the force constant of the spring
or the wire
Date:___________
Date:___________63 determine the area under a force againstextension (or compression) graph to find
the work done by the force
Date:___________
Date:___________64
select and use the equations for elastic
potential energy
and
Date:___________
Date:___________65
define and use the terms stress, strain,
Young modulus and ultimate tensile
strength (breaking stress)
Date:___________
Date:___________66
describe an experiment to determine the
Young modulus of a metal in the form of
a wire
Date:___________
Date:___________67
define the terms elastic deformation and
plastic deformation of a material
Date:___________
Date:___________68
describe the shapes of the stress against
strain graphs for typical ductile, brittle and
polymeric materials
Date:___________
Date:___________
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G481: Mechanics
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The particulate nature of matter
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G481: Mechanics
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Conservation laws
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G481: Mechanics
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Vectors