Holiday Homework Part 1

Dear 10.2W,

Because this is a Friday lesson I can’t put this on the database – make sure you complete it by next lesson (Wednesday 22/2/12)

1. Finish off worksheet (most of you have done this already)

2. Mark worksheet using attached mark scheme

Look out for Holiday Homework Part 2!

Cheers,
Mr B

Click here to download:
Q=It and V=EoverQ worksheet.doc (57 KB)
(download)

Click here to download:
2B2 answers to Q=It worksheet.ppt (253 KB)
(download)

2.17 and 2.19 Plenary worksheet

Click here to download:
Q=It and V=EoverQ worksheet.doc (57 KB)
(download)

2.19 Top Tips for Calculations

24 November 2010

10:32

Top Tips for Calculations

(The bold writing is what you write down)
1. Write down what the question tells you. I = 4A, t = 20s
2. Write down what the question asks you for. Q = ?
3. Find an equation that links all these variable.

Formula → Q = I.t (1 mark)
4. Substitution → Q = 4 x 20 (1 mark)
5. Answer and Units → Q = 80C (2 mark)

2.17 and 2.19 Plenary worksheet

15 December 2011

09:30

>

2.17

2.17

24 November 2010

10:31
· 2.17 recall and use the relationship between charge, current and time:

charge = current × time

Q = I × t

Q = I.t

Q = Charge (C, Coulomb)

I = Current (A)

t = time (s)

How to remember this formula…

"If the exam is hard, don't ever Q(u)It"

2.18

2.18 answers

24 November 2010

10:32
· 2.18 recall that electric current in solid metallic conductors is a flow of negatively charged electrons

Conventional Current
· The flow of "imaginary" positive charges from + to -
· Why? Positive charges are repelled by the positive terminal of the battery and attracted to the negative terminal of the battery
· Symbol "I"
· Used in 90% of exam questions!

I


I


I

[cid:image001.png@01CCE7E9.F3A67370]

Flow of Electrons
· The flow of real negatively charged electrons from - to +
· Why? Negative electrons are repelled by the negative terminal of the battery and attracted to the positive terminal of the battery


[cid:image002.png@01CCE7E9.F3A67370]

(download)

2.12

2.12

24 November 2010

10:15
· 2.12 describe the qualitative effect of changing resistance on the current in a circuit

Note:
· Qualitative = describe using words
· Quantitative = describe using numbers
[cid:image001.png@01CCE7E9.EA876600]

Check your answers

http://www.walter-fendt.de/ph14e/ohmslaw.htm
[cid:image002.png@01CCE7E9.EA876600]

(download)

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)