# Resources by Physics Online

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### Distance -Time and Speed

With this a-level video tutorial, the presenter talks about how we get the equation speed = distance / time and then looks at the differences between a distance / time and a speed / time graph. It also demonstrates what the area under the graph represents as well as the gradient. This can be followed by the...

### Efficiency

This video uses a comparison between an LED light and filament bulb to introduce efficiency (η).

The equation, %efficiency (η) = (useful energy out/total energy in) x100 is explained and then linked to rate of energy transfer (P=E/t).

### Electromagnet investigation and results

This video demonstrates an experiment to investigate how current affects the strength of a magnetic field. The Phyphox app on a mobile phone is used to measure the magnetic field strength. The second part explains how to plot a graph to evaluate the relationship between current and magnetic field strength.

...### Electromagnetic waves - wavelengths and frequencies

This video revises the order of electromagnetic spectrum (GCSE) and introduces the range of magnitudes of wavelengths and corresponding frequencies for each type of electromagnetic radiation.

### Electromagnetic waves - why they are transverse

This video helps students to visualise the electric and magnetic field components of an electromagnetic wave.

The electric and magnetic oscillations (vibrations) are at 90⁰ to each other and also to the direction of energy propagation.

### Experimenting with a trolley

In this video independent and dependent variables are discussed, before experimenting with a trolley on an inclined ramp. The data is then graphed and analysed to investigate any relationship between ramp height and trolley speed. This is a GCSE Physics Practical.

### Extension of a spring

A pair of videos that investigates the extension of a spring when forces are added. The first allows students to see the experiment undertaken. This is a required practical for students to understand and be able to carry out for GCSE Combined Science and Physics. The second clip explains how to plot a graph to...

### Extension of rubber

A pair of videos that investigates the extension of an elastic band when forces are added. The first allows students to see the experiment undertaken and the second clip explains how to plot a graph to evaluate the relationship.

Extension of rubber

Extension of rubber results

### Field around a magnet

This video introduces permanent magnets, their fields and how to investigate them using iron filings. It also demonstrates the field between attracting and repelling magnets.

### GCSE Physics Experiments

A brief video outlining the different types of physics experiments and their functionality.