3Turn-4
From MrReid.org Wiki
Revision as of 15:34, 26 April 2012 by Mrsaunders (Talk | contribs) (New page: ==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 plac...)
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
Starter
- Pupils to attempt principle of moments mini experiment with "rulers", pivots and small masses. Remind pupils the equation for calculating moment.
- Have pupils tabulate their results (see ppt). Give them 5-10 minutes to get some results and then discuss these with the group
Main Body of Lesson
- Move onto the giant
Plenary
- Group the class into 5 groups of increasing ability. There are three Moment Challenges of varing difficulty. 1) Measuring an unknown mass 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 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 solving it.
- If there is time they can present their problem and how they solved it.
Homework
- Read pages 54-59
- Q 1-4 pg. 55
- Q 1-2 pg. 57
- Q 1 pg. 59
Additional Information
Resources Required
- Starter- large principle of moments apparatus
- Class set of rulers suspended with a forcemeter from one end , large mass with body of truck over it, 1/2 meter rule
Moment Challenges
- Problem 1 x 3 - rulers, pivots, unknown mass, known masses
- Problem 2 x 4 - retort stand x2, hanging 100g masses x 2, pivot x 2, 1/2 metre rule x 2
- Problem 3 x 1 - large plank for pupil to lie on, large fulcrum x 2, Newton balance, metre rule x 2
Textbook References
- None
Website References
- None
Skills Addressed
Safety/Hazards
Notes
- None