Term 2 Week 2 2020

Link to HAPARA site for 10HL Ballistics Module

Link to 10HL Google Meet

Link to 10HL Science FAQ

Newton's Three Laws of Motion

1. An object at rest will remain at rest, or an object moving at a constant velocity will remain moving at a constant velocity, unless acted upon by an unbalanced force (Net Force).

i.e. Only an unbalanced force (net force) can change an object's velocity (accelerate)

2. Net force = mass x acceleration

Fnet = ma

Fnet : Sum of all the forces - unit Newton (N)

m : Mass - unit kilogram (kg)

a : Acceleration - unit meter persecond squared (ms-2 )

3. Every action has an opposite and equal reaction on the other object

Newton's Three Laws of Motion

Newton's second Law F=ma

Why don't perpetual motion machines ever work?

Term 2 Week 1 2020

Link to HAPARA site for 10HL Ballistics Module

Link to 10HL Google Meet

Link to 10HL Science FAQ

Velocity - Distance - Time

• Speed (Velocity) is a change in distance per unit time. SI unit: meters per second (m/s or (ms-1)
• Distance is a length. SI unit: meters (m)
• Time is needed for things to change. SI unit: second (s)

Using the S,D,T Triangle

Distance Time Graphs

Acceleration - Velocity - Time

• Acceleration is a change of speed (velocity) per unit time. SI unit: meters per second per second or meters per second squared (ms-2)
• Speed (Velocity) is a change in distance per unit time. SI unit: meters per second (m/s or ms-1)
• Time is needed for things to change. SI unit: second (s)

Trebuchet

Link to HAPARA site for 10HL Ballistics Module

Plans for making a Trebuchet & Catapult

Designing a Trebuchet – Optimizing Weight and Length

Cam's Trebuchet

Optimisation of Trebuchet:

1. The length of the payload arm should be 3.75 times longer than the counterweight arm.
2. The length of the sling should be the same length as thepayload arm.
3. The initial angle between the counterweight arm and the support should be 45 degrees at launch.
4. The counterweight needs to be 133 times as heavy as your intended projectile.

How to design the perfect trebuchet

Optimising a Trebuchet

Wheels on a Trebuchet

Giant Trebuchet

Most powerful trebuchet in the world

Student's Trebuchets

Fastest People in Slow Mo

How fast does glass crack?

Term 1 Week 5 2020

Human Digestive System

Rat Dissection in Lab A comming soon

Rat Dissection by Charlotte Jess and Destiny

How your digestive system works

Inside the Stomach

Pill Camera Swallowed

Tapeworm Infestation

What does the liver do?

What does the pancreas do?

How do your Kidneys do?

How the heart actually pumps blood

The Heart, Part 1

Heartbeat sound

Transporting a beating heart for transplant!

How do vitamins work?

How sugar affects the brain

What is fat?

How do carbohydrates impact your health?

Food Tests

Food TestsFood Tests:

Test	Tests for	Positive Result	Method
Iodine	Starch	Turns Blue-Black	Add a drop of iodine to food solution
Biuret (CuSO4 + NaOH)	Protein	Turns Purple-Lavender	Add a few drops of copper sulphate (CuSO4) shake and wait, then and sodium hydroxide (NaOH) to food solution
Benedict’s Solution	Sugar	With heat turns Brick-Red precipitate	Add a few drops of Benedict’s to food solution and heat gently of a bunsen
Ethanol Emulsion	Fats	White Emulsion	Add 2ml of ethanol to food solution and shake/mix, then add 2ml of water to solution and shake/mix
DCPIP	Vitamin C	Turns Colourless	Add a few drops of DCPIP to food solution and shake/mix then wait (NB: will turn pinky due to the presence of acid - false positive)

Term 1 Week 4 2020

Paper Dart Testing

In groups of three, you are going to try making a range of different paper darts and test how they perform in practice.

You are going to change the type of dart you make,
and also the length of the dart.

To test the darts, you will throw them in a repeatable way,
and measure two things.

You are going to both measure the distance it travels before it

touches the ground (not necessarily where it lands)

and the time it spends in the air before it hits the ground.

Below are some dart designs, choose two to test.

Basic Dart

Flat Nose Dart

Glider Dart

Dart Floating