# Resources by Physics Online

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### Boyle's law - GCSE and A level physics

A pair of videos that investigates the Boyle’s law relationship. The first demonstrates how to undertake the experiment using a pressure sensor and syringe. The second explains how to interpret the data, plot the graph and determine if there is a relationship between the volume of a gas and the pressure.

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### Centre of mass of a 2D shape

This video introduces and explains the centre of mass, sometimes called the centre of gravity, and how to determine it for a 2D shape.

### Characteristics of a wire

A pair of videos that investigates the Ohm’s law relationship. The first allows students to carry out an experiment on the IV characteristics of a wire (Ohm's law) from home. This is a required practical for students to understand and be able to carry out for GCSE Combined Science and Physics. The second explains...

### Charging an insulator by friction

A short video that demonstrates how to investigate the charge of different insulators due to friction.

### Conduction

This video is the full experiment in real time to investigate the rate of conduction in various metals.

### Conservation of Mechanical Energy

This video demonstrates how the gravitational potential energy of a skateboarder is converted into kinetic energy as they move down a ramp. It discusses efficiency and how you can calculate the energy mathematically at both stages. It also ties into SUVAT and demonstrates how an objects acceleration due to...

### Convection experiment

This video demonstrates a convection experiment for GCSE Physics using potassium permanganate in water with a Bunsen burner.

### Density

A pair of videos that investigates the density of different materials. The first allows students to see an experiment on the density of regular and irregular objects from home. The second part outlines the calculations used to work out the densities of cylinders of different materials. This is a required practical...

### Derived Units

This video for a-level and GCSE high ability students looks at how we derive units. It looks at why speed can be measured in m/s and then goes onto to look at the units for force using F=ma and also why we use Joules for energy. It also discusses the seven main base units and how all units are derived from these...

### Displacement -Time and Velocity

This A-level tutorial video follows on from the the distance, speed and time video. It looks at the terms displacement and velocity and how they differ from speed and time. An example of a displacement / time and velocity / time graph is given and discussed. A...