1.25

From: Matt Baker
Sent: Tuesday, November 01, 2011 5:28 PM
To: Abhimanyu Agarwal; Ameena Imran; Andrew Holloway; Caleb Bryan Fotheringham; Chamaiporn Angubolkul; Hugo Illing; Krittithep Vongvanij; Louis Rangsiman Pate; Marquie Leelatham; Melina Thompson; Nichakarn Yongsanguanchai; Noranil Butt-Gow; Nureen Aisyah Mohamed Suhardy; Patcha Nitiahpapand; Phuriphat Youngyuen; Rohan Chaurasia; Rory Leiper; Tayla May Baldwin; Thomas Daniel Mathers; Wannakanok Tongyai; William Schofield
Subject: 1.25

 Instructions for Objective 1.25

1.    1.25 Starter.  Open the attached animation “Principle of moments - 1 see-saw”.  Why doesn’t it balance?  Read the explanation.

2.    1.25.  Learn the formula and the units.  Open the attached “Just a moment!” and view as a slide show.

3.    1.25 Interactive animations and worked example.  Open the attached “Interactive animations and worked example”, Enable Content and view as a slide show.  Experiment with the interactive simulations.

4.    1.25 Principle of Moments Questions.  Forward this e-mail to your blog and type the answers into the e-mail underneath the questions.  Answers will be sent separately.  Do not look at the answers until you have posted to your blog!

5.    1.25 Plenary.  Play the attached “Principle of moments – 3 forces on a bar”.  Type your answers in to the animation and then check your answers.

 

1.25 Starter

31 October 2011

12:12

<<Principle of moments 1 see-saw.swf>>

 

·         Why doesn't the see-saw balance?

 

 

 

 

Explanation

·         The perpendicular distance from the pivot is the same on each side

·         But the force (weight) on the left is great

·         So the moment (turning force) on the left is greater

·         The see-saw will rotate anticlockwise

 

 

 

1.25

Tuesday, July 06, 2010

3:04 PM

·         1.25 recall and use the principle of moments for a simple system of parallel forces acting in one plane

Principle of Moments

·         When a system is balanced then the anticlockwise moments are equal to the clockwise moments

·         This means that the anticlockwise turning force is equal to the clockwise turning force and the system doesn't move

 

Ma = Mc

Fa x da = Fc x dc

 

Ma = anticlockwise moment (Nm)

Fa = force causing the anticlockwise rotation (N)

da = perpendicular distance of Fa from the pivot (m)

Mc = clockwise moment (Nm)

Fc = force causing the clockwise rotation (N)

dc = perpendicular distance of Fc from the pivot (m)

<<Just a Moment!.ppt>>

 

 

 

1.25 Interactive animations and worked example

31 October 2011

16:43

<<Principle of Moments - interactive animation and worked example.ppt>>

 

 

1.25 Principle of Moments Questions

29 September 2010

14:37

 

 

1.25 Plenary

31 October 2011

16:38

Quick question 

(open the animation, type in your answers and then check your answers)

<<Principle of moments - 3 forces on bar.swf>>

(download)

(download)

(download)

(download)

Click here to download:
Just a Moment!.ppt (374 KB)
(download)