Evolution Revision Questions and Answers

Questions

Revision Evolution MC Question 1
Revision Evolution MC Question 2
Revision Evolution MC Question 3/4
Revision Evolution MC Question 5
Revision Evolution MC Question 6
Evolution Revision MC Question 7
Revision Evolution MC Question 8


Answers
Revision Evolution MC Answer 1
Revision Evolution MC Answer 2
Revision Evolution MC Answer 3/4
Revision Evolution MC Answer 5
Revision Evolution MC Answer 6
Revision Evolution MC Answer 8
Revision Evolution MC Question 9

One note Topic 2 and 3 review

http://ebhigh.com/drhill/year11%20docs/Electrical%20Energy.onepkg

http://ebhigh.com/drhill/year11%20docs/Electrical%20Energy2.pdf

additional problems

Catholic link

History of Magnetism

History of magnetism
800 BC - Greek peasants began using iron nails in their shoes, a shepherds shoe got stuck on a naturally occurring magnet, ancients believed that all magnets were attracted to this shepherds mountain in the province of Magnesia.
For over a thousand years Greeks made money by selling load stones
1585AD - Dr Gilbert (Queen Elizabeth I doctor) researched Amber (fossilised tree sap)(electrons) and the famous Dr Gilberts Balls were made out of magnets and he presented them to Queen Elizabeth I. He proved the earth was a giant magnet

Around 1785 - They found currents in wires made magnetic fields are wires with currents jumped in magnetic fields

Lesson on Resistance and Power

Question 1 (Worked Example) Define Power and how it is calculated.

Power is the rate that Energy (joules) is converted form one form (electrical) to another (heat).

It is calculated from 4.8 J for each ml of water increased by 1 degree, or VxI. It has units of watts.

Question 2 What is the formula for Energy. What units are used to buy Energy.

Question 3 (Worked Example) Zany has a 1kW pool pump that operates from 8am to 10 am every day of the year. Electricity cost $ 0.25 per kWhr. What is the annual use of energy? How much does this cost Zany?

P = E/t

E = P x t

E = 1kW x 2hr x 365

E = 730 kWhr

Cost = E x rate per kWhr

Cost = 730 x 0.25 = $182.50

Question 4 Tom has as 4 bar fridges that use 200 W. How many joules of energy does he use in a year? Why is kWhr the normal unit seen on his bill?

Question 5 (Worked Example)

Anne can use 6 V on a 10 ohm light, or 12 volt on a 40 ohm light. Which produces most power? If the leads are 1 ohm, which is the brighter light?

Thus they have the same brightness. Power loss can be calculated by working out the total resistance, the current and voltage drop and then the Power loss.

Fribulation

Worked Homework

Question 9

question 9

Question 10

Question 10

Question 16

Question 11

22 Minute lecture on electrical Safety

Electrical Energy in the Home : Safety

Evolution Experiment

A start population 120 coloured tooth picks. Consisting of 6 colours of 20 sticks each.





The 120 were dispersed over a 15 x15 m area.





Two student preditors collected 10 sticks each.





From the kills the field population was calculated.





The field number divided by 5, was the number off spring that were generated and added and distributed to the field population.





In the sequence





Species - Sticks


Trait - Colour


Variation - Yellow, Orange, Red, Blue, Green,Purple


Selection - Not being Predated


Reproduction


Evolution.



We had predation out strip replacement due to over efficient predation.

The photo shows the final population after 7 seasons, havested from the field.

Holiday Homework

Summarize Chapter 7 and work through Problems 1 - 24 - Worked answers will be posted on this Blog.

Homework on Conductors

Discuss the issues and solutions in your book

Paste this in your Prac Book.

Gather information and report the sources

Process the information in a identification Table

Warning: Copper was used when it was it was cheap, now Lines use another element!

Prac Assessment

In groups you are to plan, experiment and report a prac that covers the following "Students Do" points


Write an Aim, Propose a circuit with a two resistors, various voltmeters and ammeters.
Build and test the circuit, demonstrating these points.

Leave a space in your prac books to paste these points in.

Revision links
Basic circuits
Voltage
Series and Parrallel

Galvani and Volta

refraction in the pool

More on rainbows

It may come as a shock the purple hue at the bottom of the rain bow, is not the bluest light that has been bent at the largest amount, but a superposition of a "Supernumerary" rainbow. The darker blue at the short wavelenght is being mixed with the red of the next rain bow. I have not been able to model this effect. The supernumeray rainbows are seen when the rain drop size are close to Mie white cloud scattering.

Here is another picture which to the untrained eye looks as if the last colour of the rainbow is purple, but you can see it is very light green.

If you put sunlight through a prism you get the pictures below

Dr Hill Discusses Rainbows

Rainbows occur when sunlight is refracted as it enters, totally internally reflects and finally leaves water drops suspended in clouds.

The water drops have to larger than normal cloud droplets. Light from the background comes straight to you with out being scattered as it would be for fog or a cloud.

There are different colours because the red light travels faster through water, is refracted less and is at the top of the rainbow. Blue slows more and is bent further.

Because rainbows are reflected light you can enhance them with polaroid sunnies or completely turn them off by turning your sunnies through 90 degrees.

As you can see in the first photo there is a second more dispursed rainbow as the light takes a trip throught the rainbow.

You can also see repeated rainbows ans general cloudiness beneath the rainbow.

Sickest song I have heard in a while

Homework Register

14. Start of Term 3 - Holiday Homework

13. 8/7/09 Chapter 6 Questions 26 - 32. to be worked through in class - email questions you want worked through

12. 6/7/09 Page 117 questions 4 to 16 in Jacaranda Preliminary Course Physics

11. 2/7/09 Getting Electricity into the Home

10. 29/6/9 Prac assignment - Prelim work

9. 25/6/9 Complete writting the Galvani and Volta Debate - Dates- What they thought, what was the real answer. What does this say about the history of science.

8. 25/6/9 Complete Topic Test on The World Communicates

1. Page 26 Q 14 , 15 Superposition of waves
2. Write the speeds of sound for in air, water and vacuum, the speed of light
3. What is the wavelength of 330 Hz sound
4. Summarize the properties of IR, Vis, UV, Xrays, Gamma Link
5. Question 13 Page 42
6. Summarize Chapter 4 (8/6/09)
7. Work Sheet on Motion (9/6/09)

Year 11 Homework

Please do question 14 and 15 from page 26

Exam Notification

Physics Exam 11.25 and 12.30 Moday 25 May
Homework For monday Upload a file of EM penetration.

2008 Exam will be handed in Tuesday, Scanned and corrected.

.

Homework

Upload on Moodle and Excel plot of data you have gathered about the different levels Radiation Penetrates in the atmosphere.

Log on to Moodle by going to EBHigh.com or links at the bottom of this page.

Superpostion of waves

Superposition of traveling waves means

1) Take two waves to superimpose

2) Move them to a particular time

3) Add the two together

-if both ++ they build high

-if one is zero adding is easy

-if +=- then adds to zero

Homework

Due Fri - The multiple choice from 2004 midyear

Due Monday 4 Wave graphing handout.

Holiday Homework

Summarize Chapter 1
All questions on Page 10 and 11
Summarize Chapter 2
All question on Page 25 -26

Transverse Waves-1

Reflection and Refraction of Light Waves (Huygens' Principle)

Math, Physics, and Engineering Applets

PhET Wave Interference - Electric field, Interference, Diffraction ...

Video of world's biggest wave

Fun on Computers

I can not speak highly enough of this simulation http://www.falstad.com/ripple/

Also down load http://audacity.sourceforge.net/download/windows audacity to see and hear your own voice in waves.

This program teaches Waves http://phet.colorado.edu/sims/wave-on-a-string/wave-on-a-string_en.html

High speed camera showing the critical middle bit of a collision where the kinetic energy is stored in the deformed golf ball before it springs away. Note also that the golf ball springs away with near twice the velocity of the golf club

Homework

Do question 25. Jacaranda page 242
Summarize chapter 1

Kinetic energy in Collisions

Home work Q15 and Q19 of text book

Impulse = Ft = mat = m(u-v)/txt= m(u-v) = change in momentum

Impulse has units of Ns and momentum kg.m/s

Collisions

N3 is for systems of 2 or more bodies. F1->2 =-F2->1. The force of object one on two is equal and opposite (vector speak for minus) of object two on one.
A collision is broken into three parts,

1. heading towards each other (N1),
2. touching, scrunching, and restoring (N3) and
3. heading out from each other (N1)

the collision dynamics, or how step 1 leads to step 3 is in the detail of step 2.

TIME - MOMENTUM

In the actual collision the body one and two feel equal but opposite forces for duration of time.

Considering each body (N2) we have F2->1. t = ma1.t for what happens to body 1

and F1->2. t = ma2.t. Use N3 and the formulae v-u =at to derive conservation of momentum (p)

p1= m1.v1. Conservation means momentum before = momentum after.

DISTANCE - Energy

The collision first through a scrunch deformation stage where KE is converted to mechanical deformation. If the mechanical deformation is springy or elastic, the mechanical deformation is PE (potential energy) that then explodes the particles appart. (PE restore KE).

So unlike momentum the direction matters, and the light object travels a greater distance, loosing more and gaining more KE. The maths is tricky so you will only deal with case of objects colliding and sticking together- Completely inellastic collisions.

Homework: Question 10 and 11 page 244 Jacaranda HSC science.

Thursday Lesson

Dr Hill is away today

You are to go to this link and workthrough the worksheet. I will check your books tomorrow.

You are to email me peter.hill26 reporting the progress on your assignment. Due next Tuesday
Remember - Discussion of Newton
-first law objects continuning motion
-Second law bodies decelerating and having forces(spreading the force)
-third law systems transfering momentum, Changing a lethal short impulse (Ft) to a non-lethal force (fT).
Remember - Evidence of the effectiveness of the device. Follow marking guideline.

Homework

Friday Complete question up to question 20 on page 221
Email teacher if there are problems completing.

Newton 1 (N1) in space

Tuesday - Wednesday Prac

Bike accelerates, cruises, breaks

What of Newtons laws applies to each?

N1 - Cruising, things travel in straight lines

N2- Body accelerates due to residual force acting on body

N3- System transferes force/momentum from one body to another

Assume constant acceleration - vxv = 2xaxd

work out the cruise speed

What was the stopping distance or deceleration,

Is skidding or controlled breaking more effective

Conclusion:=?

Monday

Summarize Chapter 10 - Newtons Laws
Complete all question from chapter 9
First 5 Questions from Chapter 10

Wednesday Lesson

Y11HW Summarize Chapter 10 - 1 Page. Prepare for Prac 10.1 on page 221 with book ruled up

We will look at Vector components and acceleration using Tracker. You can download it from R drive, science, yr10, physics. It will greatly assist in performing pracs


Turn vectors into scalar (projections) then back into vectors.
- Each V has projections Vxx and Vyy where x and y "Unit vectors along the axis"



Newtons Laws 1-2-3

N1 Straight line, constant velocity (Speed and Direction), if F = 0
Historical: Break with Archemedies and common sense.
Application: Cars thrown through the window

N2 Sum of Forces = Resultant Force = Mass x Acceleration. (on a body)
Historical: Invention of Mass a number to link Force (that can be felt) and acceleration (that can be seen)
Application: Anything that moves, Constant velocity means NET force is zero.
Types of Forces
Internal- Generated by a Field generated by a body at distance Force just dropped on to object. - Gravity
External - Generated by contact , two forces generated. In sum only add the forces acting on it. Strings and Friction

N3 Every force has an equal and opposite force. (in a system)
Historical: Invention of Momentum, Impulse fT or Ft, ease up or death.
Application: Collisions, Lethal force

Homework

Due Friday homework was set upto Q20 Page 190

Homework now complete to Q25

In Class we cover Q 20 and how the area under a VT curve is the displacement , the gradient is the acceleration.

We are now in a position to Revise Newtons 3 Laws:

N1: With no forces, their velocity is unchanged.

This is historical reference to the different ideas of Aristotle of Violent, and curved motion.

N2: Sum of forces = product of acceleration and mass

Here the idea of forces need to be developed. Internal forces are found the product of an external field and an objects field force factor. For gravity the field is described by g and the number inserted to create the force is the Mass. In this case we draw the force on the object, determined by the field direction and the size by the size of the field and multiplier factor. The are also external forces mostly generated by strings or by contact with surfaces. Here we draw pairs of forces at the point of contact.

The sum of forces = a resultant force, ie a single force that does not add up. and this is the acceleration.

N3 F12=-F21 for every force there is an equal and opposite force. In the case of internal forces where the force vector is inserted, there is an opposite force but it is just not on the diagram. For contact forces we draw a pair of forces that cancel. This law basically leads to the concepts of momentum transfere, and the conservation of momentum as the forces balance.

Friday Lesson

Found text book on Ebhigh.com
Did intital Moodle- test and discussion on assignment.
Homework - Q8,Q9,Q10.

More Vector Maths

Last lesson we considered a snail moving slowly North for 1s and quickly West for 1s

Here is a good interative site

This lesson we will take a fast and slow ticker tape, the slow represents current that travels N, S,W,E and you will have to find the Vector necessary to travel N.

We will reveiw Q5 on page 194 Jacaranda and set Q6 for homework.

Vector maths

Adding vectors is done by:
1) Drawing the vectors
2) breaking into X an Y components, adding Scalars, and recombining answers.

A good site with worked solutions for vector subtraction is site

Homework

Jacaranda Page 194 Questions 1 -5

distance- is between point a and b is the length of path pulled out straight(depending on the path)
= to a magnitude and unit this is a SCALAR

Displacement: is the chance in place as the "crow's flys"

= to a magnitude, unit, and direction this is VECTOR

it is draw in the diagram with an arrow. the Head is where it finishes, the tail is where it begins.
It is drawn to scale, and direction.( Diagram now needs a compass or an up)

The unit and magnitude is written half way along.

Vector addition is more complex than Scalar.....

Exercise Draw the Vector C , A+B =C

A is 8 paces north, B is 6 paces west.

Exercise Vector D Sum of ( 3 m North, 5 m East, 5 m South, 7 m West)

Exercise Vector E (Sum 7 m West, 5m South, 3 m North, 5 m East)

How do you subtract vectors? ANS go the opposite way

Exercise what is A - B ? Hint A + (-B).

Homework 28 Jan

Assumed Knowledge

Domain: knowledge and understanding:

Refer to the Science Years 7–10 Syllabus for the following:

5.6.2a) describe qualitatively the relationship between force, mass and acceleration

Force can be felt, Acceleration felt and observed, Newton invented the idea of mass as a mathematical link between force and acceleration, and the link explaining the gravitational forces between object. Mass is a mathematical value attached to an object. (Einstein also linked Mass with Nuclear Energy and there is also one further link of mass in Quantum Mechanics)

Write the equation linking Force , Mass and Acceleration.
If you were had a paddle that applied the same amount of force every time you used it. Describe how quickly you could accelerate in a Kayak that had:
a) Just you in it
b) You and a Polar Bear

5.6.2b) explain qualitatively the relationship between distance, speed and time
What two things do you need to measure speed?

Explain the “Hare and the Tortoise”

5.6.2c) relate qualitatively acceleration to change in speed and/or direction as a result of a net force

Explain what is happening in an arm wrestle.

5.6.2d) analyse qualitatively common situations involving motion in terms of Newton’s Laws.

Research Newton’s 3Laws –
Qualitatively Explain
N1: why holding a child in the front seat is not safe
N2: an arm wrestle
N3: why a punch hurts

First lesson

Your Text Book is Jacaranda HSC1
Your eBook is Excel we start with Moving about
This is a link to the eSyllabus