Revision as of 05:11, 17 April 2009

Outcomes

Pupils investigate and can apply the principle of moments for a balanced object.
Pupils investigate how the upward forces on a light beam varies with the position of a heavy object placed on the beam.

1.25 recall and use the principle of moments for a simple system of parallel forces acting in one plane
1.26 understand that the upward forces on a light beam, supported at its ends, vary with the position of a heavy object placed on the beam

Pupils apply the principle of moments for a set of 3 example questions given here, one example will test the idea that the mass acts from the centre of gravity Principle of moment example quesitons
Bridge Investigation - Pupils investigate how the upward force on a light beam (bridge) varies with the position of a heavy object (truck) placed on the beam. The set up has a forcemeter on one end and a sting hold the other end. The pupils should produce a graph on how the force varies with the distance to the end.

Set up a balloon which is electrostatically charged, on the ceiling, attach a string with a

Electrical Force - balloons for electrostatics, rice in a plastic bottle charging polythene rods and using watch glass show repulsion

A tank with water in it will be heavy and so is only to be moved by the technician; please refer to the Manual handling section of the Laboratory Lessons Health and Safety Risk Assessment
When using springs goggles must be worn
The main risk is from the vacuum pump and apparatus. The specific risk assessment must be read before using the apparatus.
General Laboratory Health and Safety Risk Assessment

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 ==Main Body of Lesson==
-* Pupils investigate the principle of moments by varying the force and distance of masses on a balanced ruler. They can calculate and show that the clockwise moment equals the anticlockwise moment.
 * Pupils apply the principle of moments for a set of 3 example questions given here, one example will test the idea that the mass acts from the centre of gravity [[Principle of moment example quesitons]]
 * [[Bridge Investigation]] - Pupils investigate how the upward force on a light beam (bridge) varies with the position of a heavy object (truck) placed on the beam.  The set up has a forcemeter on one end and a sting hold the other end. The pupils should produce a graph on how the force varies with the distance to the end.