<p><strong>The Powerpoint slides cover the basic principles of Levers supported by explanatory diagrams, together with real-life examples illustrating ways in which the lever principle is put to good use to easily create a larger force, such as in the case of removing a bicycle tyre by means of a tyre lever. Several other examples are included. The slides will be useful for the teacher to run through, immediately prior to teaching the topic, and also will be suitable, without modification, for use in the classroom.</strong></p>

<p>The animated slides explain the basic principles of friction and include real-life examples of frictional forces, such as bicycle brakes.</p> <p>The slides will be useful for the teacher to run through immediately prior to teaching a topic and also will be suitable, without modification, for use in the classroom.</p>

<p>The detailed animated slides explain how the use of pulleys enables heavy objects to be lifted, and large forces created, by exerting only a small force.</p> <p>The slides will be useful for the teacher to run through immediately prior to teaching the topic and also will be suitable, without modification, for use in the classroom.</p>

<p>The detailed animated slides describe a simple experimental investigation on an easily created simple pendulum.</p> <p>The purpose of the investigation is to determine the effect of pendulum length on the frequency of oscillations.</p> <p>Results are presented, followed by construction of a non-linear graph, which enables an assessment to be made of the required length of pendulum for a frequency of 50 swings per minute.</p> <p>The pupils are then invited to conduct an experimental investigation of their own, and finally formulate conclusions regarding the relationship between the length of a pendulum and its frequency of oscillations.</p>

<p>The Powerpoint animated explanatory slides explain the effect created in an object by the application of tension, compression and bending loading.<br /> Particularly interesting are the multi-coloured fringe patterns (representing the stresses) produced in loaded plastic test pieces.<br /> The slides will be useful for the teacher to run through immediately prior to teaching the topic and also will be suitable, without modification, for use in the classroom.</p>

<p>The detailed animated slides explain the basic principles of gears, gearboxes and sprockets, illustrated by examples including bicycles and winches.</p> <p>The slides will be useful for the teacher to run through immediately prior to teaching the topic, and will also be useful, without modification, for use in the classroom.</p>

<p>The detailed animated slides explain mechanical stiffness and illustrations include the effect of load applied to coil springs.</p> <p>The slides will be useful for the teacher to run through immediately prior to teaching the topic, and will also be useful, without modification, for use in the classroom.</p>

<p>The detailed animated slides explain the basic principles of the mechanics of push and pull forces, with the aid of diagrams and real-life examples.</p> <p>The slides will be useful for the teacher to run through immediately prior to teaching the topic and will be suitable, without modification, for use in the classroom.</p>

<p>The detailed animated slides explain how pressure can be used to generate large forces.</p> <p>Particularly interesting will be the description of how a hydraulic jack (of the type used for ‘jacking-up’ a car), works.</p> <p>The slides will be useful for the teacher to run through immediately before teaching the topic and also will be useful, without modification, for use in the classroom.</p>

<p>The detailed animated slides illustrate the squashing of a coke can using a DIY Load Testing Machine.</p> <p>The slides show how the machine was calibrated by applying a known load mass to a set of four coil springs, so that the amount of deflection of the springs was able to indicate the applied load at any time the test machine was being used.</p> <p>The slides also reinforce some of the basic principles associated with forces.</p> <p>The slides will be useful for the teacher to run through immediately prior to teaching the topic, and will also be suitable, without modification, for use in the classroom.</p>

<p>The detailed animated slides explain how forces are created by movement.</p> <p>The slides wil be useful for the teacher to run through immediately prior to teaching the topic and also will be suitable, without modification, for use in the classroom.</p>

<p>The Powerpoint animated explanatory slides explain the effect created in an object by the application of tension, compression and bending loading.<br /> Particularly interesting are the multi-coloured fringe patterns (representing the stresses) produced in loaded plastic test pieces.<br /> The slides will be useful for the teacher to run through immediately prior to teaching the topic and also will be suitable, without modification, for use in the classroom.</p>

<p>The animated slides explain how forces can be generated by use of screw-threads, including every-day examples such as clamps and car scissor jacks.</p> <p>The slides will be useful for the teacher to run through immediately prior to teaching the topic and will also be useful, without modification, for use in the classroom.</p>

<p>This resource includes six video clips, each with beautiful vivid multi-coloured fringe patterns.</p> <p>The video clips demonstrate how repeated loading of transparent plastic models produces dynamically changing coloured fringe patterns.</p> <p>The fringe patterns represent the internal stresses in the material of each of the loaded test pieces, resulting from the application of load.l</p> <p>This helps children to understand that forces produce stresses in objects and the material of which the object is made, needs to be strong enough to sustain the loading and resulting internal stresses, so as to avoid fracture of the object.</p> <p>The video clips will be useful for the teacher to view immediately prior to teaching the topic, and will also be suitable for use in the classroom.</p>