# Resources by Physics Online

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A physics revision workbook with both questions and worked answers.

### Gravitational potential energy

This video begins by introducing the three forms of potential energy (gravitational, electric and elastic). The formula Ep=mgh is derived by applying Newton’s second law (F=mg) and work done (w=Fs).

### Half-life of a model radioactive source

In this video clip radioactive decay is modelled using the rolling of dice. The data are plotted on a graph and the half-life is determined.

### Infrared radiation absorbed results

This video clip demonstrates an investigation into the absorption of infrared radiation by different surfaces. This is a required practical for students to understand and be able to carry out for GCSE Combined Science and Physics.

### Infrared radiation emitted

A pair of videos that investigates the emission of infrared radiation by different surfaces. The first allows students to see the experiment undertaken and the second clip explains how to plot a graph to evaluate the relationship. This is a required practical for students to understand and be able to carry out for...

### IV Characteristics of a bulb

A pair of videos that investigates the IV characteristics of a filament bulb. The first allows students observe the experiment, which is a required practical for students to be able to understand and carry out for GCSE Combined Science and Physics. The second explains how to interpret the data, plot the graph and...

### IV Characteristics of a diode

A pair of videos that investigates the IV characteristics of a diode. The first allows students observe the experiment, which is a required practical for students to be able to understand and carry out for GCSE Combined Science and Physics. The second explains how to interpret the data, plot the graph and...

### IV Characteristics of a resistor

A pair of videos that investigates the IV characteristics of a resistor. The first allows students observe the experiment, which is a required practical for students to be able to understand and carry out for GCSE Combined Science and Physics. The second explains how to interpret the data, plot the graph and...

### Kinetic energy

This video explains that moving objects have kinetic energy (E_{k}) and shows how E_{k} is proportional to both the mass and velocity of an object.

By combining the formulae F=ma and W=Fs to obtain W=mas and using v^{2}=u^{2} + 2as (assuming u^{2}=0), E_{k}=...

### Lamps in series and parallel

A pair of videos that investigates the characteristics of lamps in series and parallel circuits. This first video allows students to carry out the experiment and the second reviews the results. This is a required practical for students to be able to understand and carry out for GCSE Combined Science and Physics...