A2 Unit 4 : PHYA4 : Further Mechanics & Fields
This page supports the lessons for the first unit of the year 13 A2 qualification:

Lesson
Notes
Resources & Links



1
Introduction to A2

2
Momentum 1
  • To understand what momentum is
  • To understand conservation of momentum and to be able to complete related calculations
  • To understand different types of collision, to be able to complete related calculations and to be able to classify a collision as either elastic or inelastic

3
Momentum 2
  • To revisit Newton’s 2nd law in terms of momentum.
  • To define the impulse of a force and connect it to the change in momentum
  • To understand the significance of the area under a force v time graph
  • To be able to complete “impulse of a force” calculations
  • To revisit car safety

4
Momentum 3
  • To Summarise what has been learnt about momentum by looking at real world examples.
  • Rebound impacts including oblique impacts
  • Dropped balls
  • Explosions & Guns
  • Rockets & Water jets

5
Circular Motion 01
  • To summarise the relationship between degrees and radians
  • To understand the term angular displacement
  • To define angular velocity
  • To connect angular velocity to the period and frequency of rotation
  • To connect angular velocity to linear speed

6
Centripetal Force
  • To consider speed & velocity around a circle
  • To consider acceleration as a change in velocity
  • To define an equation for centripetal acceleration
  • To define an equation for centripetal force

7
Banked Tracks
  • To show that the centripetal force is provided by real world forces such as tension, gravity & friction
  • To consider three particular cases of motion:
  • Over the top of a hill or humped back bridge
  • Around flat curves (roundabouts)
  • Around banked curves

8
Fairgrounds
  • To apply what we have learnt about circular motion to rides at the fairground
  • To consider three particular cases of motion:
  • The big dipper
  • The long swing
  • The “centrifuge” wall of death

9
Oscillations
  • To introduce some common examples of simple harmonic motion
  • To define some common terms such as period and frequency
  • To think about the phase relationship between displacement, velocity, force & acceleration

10
Principles of Simple Harmonic Motion
  • To arrive at the relationship between displacement, velocity and acceleration for a system in SHM
  • To be able calculate the magnitude & direction of the acceleration at any time for an object in SHM
Khan Academy: Introduction to Harmonic Motion

11
SHM Displacement and Velocity
  • To investigate the relationship between circular motion and SHM
  • To be able to calculate the displacement at any particular moment under different starting conditions
  • To be able to calculate the velocity at any particular moment.

12
Simple Pendulum Practical
No slides
13
Simple Pendulum Theory
  • To establish which factors influence the period of a pendulum
  • To understand how the period of a simple pendulum can be used to establish a value for g experimentally

14
SHM Application 2. Mass of a spring
  • To recognise that a loaded spring is an application of SHM
  • To review Hooke’s law
  • To establish the period of an oscillating loaded spring
  • To review springs in parallel & series

15
Damping
Jack Knife Protection
Unstable Caravan Jack knife
Damping & Resonance @ Salford
  • To be able to answer the question “What is Damping?”

16
SHM and Energy
  • To understand the energy transformations which take place during simple harmonic motion

17
Resonance
Tacoma Bridge
London Millenium Bridge
The Opening of the Millenium Bridge
  • To Understand resonance
  • To be able to qualitatively explain how a system behaves at resonance and on either side of resonance in terms of amplitude & phase
  • To look at some real world examples of resonance

18
Gravitational Fields 01
  • To understand what we mean by gravity
  • To understand how we represent a gravitational field
  • To look at radial and uniform fields
  • To understand what we mean by the strength of a gravitational field
  • To revisit what we mean by “g”


No lesson Y7 CATs cover

17
Slight cock-up! An extra SHM lesson was required and is numbered as 13B above
Fully worked example for PQ A_04
19
Gravitational Fields 02
  • To investigate the value of g on other planets in our solar system & to practice our graph drawing and other practical skills
  • To recreate some of Newton’s work on gravitation & to establish Newton’s law of gravitation
  • To use Newton’s law to establish the gravitational force of attraction between two objects

20
Gravitational Fields 03
Animation showing how g changes around the Earth
  • To investigate how the gravitational field strength varies as you move away from a planet and also inside the planet
  • To begin to explore the concept of Gravitational potential

20
Gravitational Fields 04
  • To continue to explore the concept of Gravitational potential
  • To examine gravitational potential near a spherical planet

21
Satellites
  • To do some sums!
  • To define what a satellite is
  • To describe two popular types of orbit for man-made satellites
  • To connect Satellite motion with circular motion
  • To look at Kepler’s third law

22
Static Electricity 01
Balloons & Static
John Travoltage
Gold Leaf Electroscope
More anvanced Electroscope
Another Electroscope
Petrol Pump Explosion Caused by Static
ElectroStatic Discharge
  • To examine the concept of Electric field strength (two ways)
  • To examine the factors which affect the nature of an electric field

23
Electric Field Strength
  • To recap what we can remember from Y11 about static electricity

24
Coulombs Law
  • To look at the work of Charles Coulomb
  • To understand electric potential


Half-Term Revision for Further Mechanics Exam. Open book exam and mark scheme

25
Revision for further mechanics, (nothing new just merged powerpoints)

26
Resonance (by popular demand). Inserted above as 15B

27
Electric Field Catchup Lesson (After return from sickness)

28
Point Charges
Comparing Gravitational and Electric fields
  • To understand what we mean by “point charge”
  • To consider field strength as a vector
  • To apply our knowledge of equipotentials to electric fields
  • To understand what is meant by potential gradients

29
How Electric Fields Vary with distance
  • To investigate how Electric field strength and Electric potential vary with distance

30
Capacitors 01
  • To understand what a capacitor is
  • To understand their applications
  • To understand how we define capacitance

31
Energy Stored in a Capacitor
  • To understand that when a capacitor is charged it stores energy
  • To be able to calculate the amount of energy stored
  • To be able to solve problems involving the energy stored in a capacitor

32
Charging & Discharging through fixed resitors
  • To qualitatively understand how a capacitor discharges through a resistor
  • To derive the equation which defines this rate of discharge
  • To be able to solve capacitor discharge problems

33
Capacitor Summary
  • To look at how capacitor discharge may be examined in the lab
  • To revisit capacitor applications (particularly timing circuits)
  • To understand charging a capacitor through a fixed resistor

34
Magnetc Fields Introduction
  • To recap the nature of the magnetic field around a bar magnet & the Earth
  • To understand the nature of the magnetic field around a current carrying wire
  • To be able to calculate the magnitude & direction of the force on a current carrying wire in a magnetic field

35
Electric Motors & Forces on Charged particles
  • To apply are knowledge about electromagnetic behaviour to electric motors
  • To understand moving charges in magnetic fields
  • To derive an equation for the force experienced by moving charges in magnetic fields

36
Charged Particles in Circular Orbits
  • To understand that the path of a charged particle in a magnetic field is circular
  • To equate the force due to the magnetic field to the centripetal force
  • To examine practical applications of circular displacement of particles

37
Generating Electricity : Electromagnetic Induction
  • To understand how to generate electricity using electromagnetic induction
  • To be able to establish the relative direction of the field, motion & induced current by using the “dynamo rule”

38
Induction Laws
  • To understand the direction of induced currents and their associated fields
  • To introduce the terms magnetic flux and magnetic flux linkage
  • To be able to calculate the size of the induced EMF for a given generator arrangement

39
Catch Up Problems



40
AC Generation
  • To understand how we generate alternating current (A.C.)
  • To begin to appreciate some of the advantages of A.C.

41
Back EMF
  • To understand that a spinning motor is also a generator
  • To understand how electric motors behave when lightly or heavily loaded

42
Transformers
  • To understand that transformers are all around us in everyday life
  • To understand the significance of A.C.
  • To be able to specify transformers using the “transformer rule”
  • To be able to complete efficiency calculations

43
The National Grid


NOTE ADDITIONAL RESOURCES RELATED TO THE PRACTICAL EXAM CAN BE FOUND UNDER UNIT 3