Revision as of 03:04, 17 April 2009

Outcomes

• Pupils can identify the force, pivot and perpendicular distance to the pivot for a range of machines/tools and are able to calculate the moment in Nm.
• Pupils understand how the force and distance are related to the moment. They will investigate the relationships by altering the force and measure distnce for a range of masses on a balanced system.
• Pupils are to understand the practical applications of changing the force and perpendicular distance for tools.
• Pupils can find the centre of gravity for a lamina using a pin and plumbline.
• Pupils can label the centre of gravity for a range of objects and can appreciate that it may not be located on the object itself.

Specification References

• 1.23 recall and use the relationship between the moment of a force and its distance from the pivot: moment = force x perpendicular distance from the pivot
• 1.24 recall that the weight of a body acts through its centre of gravity

Starter

Main Body of Lesson

Forces circus

• File too large to upload - laminated copies are provided with the circus- copy in science

Plenary

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

Homework

• Labelling forces homework sheet
• file too large to upload - look in science shared

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

• Obtaining

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