4-FAD-03
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Contents
Outcomes
- Pupils 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.
Specification References
- 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
Starter
- 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
Main Body of Lesson
- 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.
Plenary
- Group the class into 5 groups of increasing ability. There are three Moment problems of varing difficulty. 1) 2) To find the mass of a retort stand using the principle of moments and 3) to find the centre of mass of a student.
- Have two groups attempt activity 1, another two groups of higher ability attempt activity 2 and one group of highest ability can be challenged by activity 3. All three activities have cards explaining what they need to do and also have a Moments hint card to help groups who are stuggling.
- They should be asked to read through the card and have a look at the equipment. They should then discuss the activity as a group and then go onto try solving it.
- If there is time they can present their problem and how they solved it.
Homework
Additional Information
Resources Required
- Electrical Force - balloons for electrostatics, rice in a plastic bottle charging polythene rods and using watch glass show repulsion
Textbook References
- None
Website References
- None
Skills Addressed
Safety/Hazards
- 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
Notes
- None