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Determine an approximate value for the acceleration of free fall using a tennis ball, metre ruler and a stopwatch.

Drop the ball from a given height that is measured with the ruler and measure the time it takes for it to reach the ground using the stopwatch. Use the appropriate SUVAT equation of motion: we have a height ...
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Answered by Viktoria N. • Physics tutor
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Topic - force as rate of change of momentum; (i) force on a wall due to water from a hose, (ii) force on a table as a rope is dropped onto it.

The question starts with a simple calculation that illustrates how a force can be calculated as the rate of change of momentum. It should be understood by most students; however, the answer can then be used ...
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How do I convert between eV and J

eV means electron volt - that is, it the amount of energy required for an electron to travel down (or up) a potential gradient with a potential difference of 1V. This energy, known as the work done, W, is gi...
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What is the Photoelectric effect?

The photoelectric effect is the stimulated emission of electrons from a (generally metallic) material upon irradiation with light of sufficient energy (light of a short enough wavelength). The incident photo...
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Explain what happens in terms of current induced as a magnet enters a solenoid in a closed circuit, and as it leaves.

This is an application to Faraday's and Lenz' laws of electromagnetic induction. So as the magnet moves into the coil, the magnetic field from the magnet moves through the coil, therefore there is a change i...
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Answered by Danruh L. • Physics tutor
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