Powerpoint lecture and associated PDF worksheet covering the following in a modern, concise format: Specification Point 5.15 - Explain how molecules in a gas have random motion and that they exert a force and hence a pressure on the walls of a container. Specification Point 5.16 - Understand why there is an absolute zero of temperature which is –273 °C. Specification Point 5.17 - Describe the Kelvin scale of temperature and be able to convert between the Kelvin and Celsius scales. Specification Point 5.18 - Understand why an increase in temperature results in an increase in the average speed of gas molecules. Specification Point 5.19 - Know that the Kelvin temperature of a gas is proportional to the average kinetic energy of its molecules. Specification Point 5.20 - Explain, for a fixed amount of gas, the qualitative relationship between: pressure and volume at constant temperature, pressure and Kelvin temperature at constant volume. Specification Point 5.21 - Use the relationship between the pressure and Kelvin temperature of a fixed mass of gas at constant volume. Specification Point 5.22 - Use the relationship between the pressure and volume of a fixed mass of gas at constant temperature. Complete set of Chapter 5 Lessons are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 8.7 - Understand how stars can be classified according to their colour. Specification Point 8.8 - Know that a star’s colour is related to its surface temperature. Specification Point 8.9 - Describe the evolution of stars of similar mass to the Sun through the following stages: nebula, star, red giant and white dwarf. Specification Point 8.10 - Describe the evolution of stars with a mass larger than the Sun. Complete set of Chapter 8 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 7.1 - Use the following units: becquerel (Bq), centimetre (cm), hour (h), minute (min) and second (s). Specification Point 7.2 - Describe the structure of an atom in terms of protons, neutrons and electrons. Specification Point 7.3 - Know the terms atomic number, mass number and isotope. Specification Point 7.4 - Know that alpha particles, beta particles and gamma rays are ionising radiations emitted from unstable nuclei in a random process. Specification Point 7.5 - Describe the nature of alpha particles, beta particles, and gamma rays, and recall that they may be distinguished in terms of penetrating power and ability to ionise. Specification Point 7.6 - Practical: investigate the penetration powers of different types of radiation using either radioactive sources or simulations. Specification Point 7.7 - Describe the effects on the atomic and mass numbers of a nucleus of the emission of each of the four main types of radiation (alpha, beta, gamma and neutron radiation). Specification Point 7.8 - Understand how to balance nuclear equations in terms of mass and charge. Complete set of Chapter 7 Lectures are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 28 - Radioactivity Part 1. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 7.1 - Use the following units: becquerel (Bq), centimetre (cm), hour (h), minute (min) and second (s). Specification Point 7.2 - Describe the structure of an atom in terms of protons, neutrons and electrons. Specification Point 7.3 - Know the terms atomic number, mass number and isotope. Specification Point 7.4 - Know that alpha particles, beta particles and gamma rays are ionising radiations emitted from unstable nuclei in a random process. Specification Point 7.5 - Describe the nature of alpha particles, beta particles, and gamma rays, and recall that they may be distinguished in terms of penetrating power and ability to ionise. Specification Point 7.6 - Practical: investigate the penetration powers of different types of radiation using either radioactive sources or simulations. Specification Point 7.7 - Describe the effects on the atomic and mass numbers of a nucleus of the emission of each of the four main types of radiation (alpha, beta, gamma and neutron radiation). Specification Point 7.8 - Understand how to balance nuclear equations in terms of mass and charge. Complete set of Chapter 7 Worksheets are available.

Complete set of concise, modern presentations for Edexcel IGCSE Physics (4PH1) Chapter 7 - Radioactivity. Contains colour coded specification points. Three presentations included: 28 - Radioactivity Part 1 29 - Radioactivity Part 2 30 - Fission and Fusion

Complete set of companion PDF worksheets for Edexcel IGCSE Physics (4PH1) Chapter 6 - Magnetism and Electromagnetism. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Three worksheets included: 25 - Magnetism 26 - Electromagnets Part 1 27 - Electromagnets Part 2

Powerpoint lecture covering the following in a modern, concise format: Specification Point 6.9P - Describe the construction of electromagnets. Specification Point 6.10P - Draw magnetic field patterns for a straight wire, a flat circular coil and a solenoid when each is carrying a current. Specification Point 6.11P - Know that there is a force on a charged particle when it moves in a magnetic field as long as its motion is not parallel to the field. Specification Point 6.17P - Describe the structure of a transformer, and understand that a transformer changes the size of an alternating voltage by having different numbers of turns on the input and output sides. Specification Point 6.18P - Explain the use of step-up and step-down transformers in the large-scale generation and transmission of electrical energy. Specification Point 6.19P - Know and use the relationship between input and output voltages and the turns ratio for a transformer. Specification Point 6.20P - Know and use the relationship between input power and output power. Complete set of Chapter 6 Lectures are available.

Complete set of concise, modern presentations for AQA A Level Psychology (7181 and 7182) Chapter 17 - Addiction. Contains colour coded specification points. Four presentations included: 85 - Smoking Addictions 86 - Gambling Addictions 87 - Risk Factors in Addictions 88 - Reducing Addictive Behaviour

Powerpoint lecture covering the following in a modern, concise format: Specification Point 6.8 - Know that an electric current in a conductor produces a magnetic field around it. Specification Point 6.12 - Understand why a force is exerted on a current-carrying wire in a magnetic field, and how this effect is applied in simple D.C. electric motors and loudspeakers. Specification Point 6.13 - Use the left-hand rule to predict the direction of the resulting force when a wire carries a current perpendicular to a magnetic field. Specification Point 6.14 - Describe how the force on a current-carrying conductor in a magnetic field changes with the magnitude and direction of the field and current. Specification Point 6.15 - Know that a voltage is induced in a conductor or a coil when it moves through a magnetic field or when a magnetic field changes through it and describe the factors that affect the size of the induced voltage. Specification Point 6.16 - Describe the generation of electricity by the rotation of a magnet within a coil of wire and of a coil of wire within a magnetic field, and describe the factors that affect the size of the induced voltage. Complete set of Chapter 6 Lectures are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 5 - Gravity, Weight and Drag. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.18 - Know and use the relationship between weight, mass and gravitational field strength. Specification Point 1.19 - Know that the stopping distance of a vehicle is made up of the sum of the thinking distance and the braking distance. Specification Point 1.20 - Describe the factors affecting vehicle stopping distance, including speed, mass, road condition and reaction time. Specification Point 1.21 - Describe the forces acting on falling objects and explain why falling objects reach a terminal velocity. Complete set of Chapter 1 Worksheets are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.3.5 - Schizophrenia. Drug therapy: typical and atypical antipsychotics. Cognitive behaviour therapy and family therapy as used in the treatment of schizophrenia. The importance of an interactionist approach in explaining and treating schizophrenia. Complete set of Chapter 12 Lectures are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 4.3.6 - Eating behaviour. Biological explanations for anorexia nervosa, including genetic and neural explanations. Psychological explanations for anorexia nervosa: family systems theory, including enmeshment, autonomy and control; social learning theory, including modelling, reinforcement and media; cognitive theory, including distortions and irrational beliefs. Complete set of Chapter 13 Lectures are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 7 - Momentum. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.25 - Know and use the relationship between momentum, mass and velocity. Specification Point 1.26 - Use the idea of momentum to explain safety features. Specification Point 1.27 - Use the conservation of momentum to calculate the mass, velocity or momentum of objects. Specification Point 1.28 - Use the relationship between force, change in momentum and time taken. Specification Point 1.29 - Demonstrate an understanding of Newton’s third law. Complete set of Chapter 1 Worksheets are available.

Powerpoint lecture covering the following in a modern, concise format: Specification Point 1.25 - Know and use the relationship between momentum, mass and velocity. Specification Point 1.26 - Use the idea of momentum to explain safety features. Specification Point 1.27 - Use the conservation of momentum to calculate the mass, velocity or momentum of objects. Specification Point 1.28 - Use the relationship between force, change in momentum and time taken. Specification Point 1.29 - Demonstrate an understanding of Newton’s third law. Complete set of Chapter 1 Lectures are available.

Companion PDF worksheet for Edexcel IGCSE Physics Lecture 8 - Forces and Moments. Contains short answer questions, an activity requiring lateral thinking and exam-style questions. Specification Point 1.30P - Know and use the relationship between the moment of a force and its perpendicular distance from the pivot. Specification Point 1.31P - Know that the weight of a body acts through its centre of gravity. Specification Point 1.32P - Use the principle of moments for a simple system of parallel forces acting in one plane. Specification Point 1.33P - Understand how the upward forces on a light beam, supported at its ends, vary with the position of a heavy object placed on the beam. Complete set of Chapter 1 Worksheets are available.

Complete set of concise, modern presentations for AQA A Level Psychology (7181 and 7182) Chapter 14 - Aggression. Contains colour coded specification points. Four presentations included: 76 - Biological Explanations of Aggression 77 - Ethological and Evolutionary Explanations of Aggression 78 - Social Explanations of Aggression 79 - Aggression in the Real World