Rory IGCSE Physiks http://roryigcsephysics.posterous.com Most recent posts at Rory IGCSE Physiks posterous.com Thu, 16 Feb 2012 20:18:07 -0800 Holiday Homework Part 1 http://roryigcsephysics.posterous.com/holiday-homework-part-1 http://roryigcsephysics.posterous.com/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

Q=It and V=EoverQ worksheet.doc Download this file

2B2 answers to Q=It worksheet.ppt Download this file

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Thu, 16 Feb 2012 20:18:04 -0800 2.17 and 2.19 Plenary worksheet http://roryigcsephysics.posterous.com/217-and-219-plenary-worksheet http://roryigcsephysics.posterous.com/217-and-219-plenary-worksheet
Q=It and V=EoverQ worksheet.doc Download this file

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

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Thu, 16 Feb 2012 20:17:55 -0800 2.19 http://roryigcsephysics.posterous.com/219 http://roryigcsephysics.posterous.com/219 2.19

24 November 2010

10:32
· 2.19 recall that:
· voltage is the energy transferred per unit charge passed
· the volt is a joule per coulomb.

V = E/Q or E = Q.V

V = Voltage (V)

E = Energy (J)

Q = Charge (C)

Therefore 1V = 1J/C

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Thu, 16 Feb 2012 20:17:09 -0800 2.17 http://roryigcsephysics.posterous.com/217 http://roryigcsephysics.posterous.com/217 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"

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Thu, 16 Feb 2012 20:17:00 -0800 2.18 http://roryigcsephysics.posterous.com/218 http://roryigcsephysics.posterous.com/218 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]

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Thu, 16 Feb 2012 20:16:42 -0800 2.12 http://roryigcsephysics.posterous.com/212 http://roryigcsephysics.posterous.com/212 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]

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Tue, 08 Nov 2011 18:21:42 -0800 1.25 http://roryigcsephysics.posterous.com/125 http://roryigcsephysics.posterous.com/125

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>>

Principle of moments 1 see-saw.swf Download this file

Principle of Moments - interactive animation and worked example.ppt Download this file

Principle of moments - 3 forces on bar.swf Download this file

Just a Moment!.ppt Download this file

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Tue, 08 Nov 2011 18:21:28 -0800 Answers http://roryigcsephysics.posterous.com/answers http://roryigcsephysics.posterous.com/answers

From: Matt Baker
Sent: Tuesday, November 01, 2011 5:29 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: Answers

Here are the answers to the questions as promised.  Now correct the work that you blogged.  Two options to do this:

1.    Send another e-mail to your blog called “Corrections to…” and highlight the changes in a different colour.

2.    Edit your blog post and make the changes in a different colour.

Cheers,

Mr B

 

1.23 Moments answers

31 October 2011

12:06

<<1.23 Answers PFY p.106 2a, 2b, 3.ppt>>

 

 

 

 

1.25 Principle of Moments Answers

31 October 2011

12:06

<<1.25 Answers PFY p.106 4+5.ppt>>

 

 

 

1.26 Answer

31 October 2011

17:36

1.25 Answers PFY p.106 4+5.ppt Download this file

1.23 Answers PFY p.106 2a, 2b, 3.ppt Download this file

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Tue, 08 Nov 2011 18:21:05 -0800 1.23 http://roryigcsephysics.posterous.com/123 http://roryigcsephysics.posterous.com/123

From: Matt Baker
Sent: Tuesday, November 01, 2011 5:27 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: 1.23

Dear 10.2W,

Welcome to your second e-lesson!  I know it’s a day early but I’m probably going to be without internet tomorrow…

This e-lesson consists of 3 objectives; 1.23, 1.25 and 1.26. 

  Instructions for Objective 1.23

1.    1.23.  Learn the formula and units.  Have a go at the quick questions (the five animations attached)

2.    1.23 Moments Questions.  Forward this e-mail to your blog.  Type your answers under the questions. 

3.    Answers to step 2 will be sent separately.  Don’t look at them until you’ve done the work!

 

1.23

Tuesday, July 06, 2010

3:04 PM

·         1.23 recall and use the relationship between the moment of a force and its distance from the pivot: 

moment = force × perpendicular distance from the pivot

·        A moment is a turning force

·        It depends on the size of the force and the perpendicular distance from the pivot

M = F x d

 

M = moment (Nm)

F = force (N)

d = perpendicular distance from the pivot (m)

Worked example

Image001

M = F x d

M = 1 x 5

M = 5Nm

Quick questions. 

(No need to type anything - just open the animation, choose your answer and then check your answer)

<<Moments - door.swf>>

<<Moments 1 - wheelbarrow.swf>>

<<Moments 2 - door.swf>>

<<Moments 3 - rod.swf>>

<<Moments 4 - scissors.swf>>

 

 

1.23 Moments Questions

29 September 2010

14:37

PFY p106

Moments 4 - scissors.swf Download this file

Moments 3 - rod.swf Download this file

Moments 2 - door.swf Download this file

Moments 1 - wheelbarrow.swf Download this file

Moments - door.swf Download this file

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Tue, 04 Oct 2011 20:29:11 -0700 1.11 http://roryigcsephysics.posterous.com/111 http://roryigcsephysics.posterous.com/111

 

 

Force Diagrams.ppt Download this file

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Tue, 04 Oct 2011 20:28:40 -0700 1.12 http://roryigcsephysics.posterous.com/112 http://roryigcsephysics.posterous.com/112
Adding vectors along a line.ppt Download this file

 

 

1.12

Tuesday, July 06, 2010

3:04 PM

·         1.12 add forces that act along a line

<<Adding vectors along a line.ppt>>

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Tue, 04 Oct 2011 20:28:38 -0700 1.9 http://roryigcsephysics.posterous.com/19 http://roryigcsephysics.posterous.com/19

 

 

1.9

Tuesday, July 06, 2010

3:04 PM

1.9 identify various types of force (eg weight, electrostatic etc)

<<Types of forces.ppt>>

Types of forces.ppt Download this file

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Tue, 04 Oct 2011 20:28:06 -0700 1.10 http://roryigcsephysics.posterous.com/110 http://roryigcsephysics.posterous.com/110

1.10

Tuesday, July 06, 2010

3:04 PM

·         1.10 distinguish between vector and scalar quantities

Sort the following into the table below:

distance, velocity, time, displacement, speed, acceleration, money (baht), energy, force, power, momentum, mass, weight, sausages.

Scalar         

Vector                              

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Tue, 04 Oct 2011 20:28:05 -0700 : 1.15 http://roryigcsephysics.posterous.com/-115 http://roryigcsephysics.posterous.com/-115

The Hammer and the Feather.flv Watch on Posterous

1B3A Dropping Two Balls Gravity.swf Download this file

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Tue, 04 Oct 2011 20:28:03 -0700 1.8 http://roryigcsephysics.posterous.com/18 http://roryigcsephysics.posterous.com/18

\

1.8

Tuesday, July 06, 2010

3:04 PM

·         1.8 express a force as a push or pull of one body on another

<<Pushes and Pulls.ppt>>

Pushes and Pulls.ppt Download this file

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Tue, 04 Oct 2011 20:27:42 -0700 Answers to 1.7 Plenary http://roryigcsephysics.posterous.com/answers-to-17-plenary http://roryigcsephysics.posterous.com/answers-to-17-plenary

Answers to 1.7 Plenary

Tuesday, July 06, 2010

3:04 PM

·         1.7 determine the distance travelled from the area between a velocity-time graph and the time axis

 

Distance Time Graph

Velocity Time Graph

Gradient

Velocity

Acceleration

Area under Graph

No meaning!

Displacement

 

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Tue, 04 Oct 2011 20:27:39 -0700 1.14 http://roryigcsephysics.posterous.com/114 http://roryigcsephysics.posterous.com/114

 

1.14

Tuesday, July 06, 2010

3:04 PM

•        1.14 recall and use the relationship between unbalanced force, mass and acceleration:           

force = mass × acceleration           

F = m × a                            

 

 

<<1B2ppt Balanced and Unbalanced forces (presentation).ppt>>

 

<<1B2v forces on a cyclist.swf>>

 

<file://Z:\Secondary\Science\Science Resources\Physics\2 IGCSE\.P1-P8 IGCSE Resources\P1 Forces & Motion\P1 RESOURCES\P1 MABA resources\1B Forces, movement and shape\1B2 Balanced and Unbalanced Forces (1)\1B2v forces on a cyclist.swf>

 

 

1B2v forces on a cyclist.swf Download this file

1B2ppt Balanced and Unbalanced forces (presentation).ppt Download this file

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