Year+07+Forces



= Science: Year 7: Forces =

Forces are fantastic!
Forces are the things that make jumps, spins, dives, acceleration and braking cool and exciting. They are the things that make you screaming joy-rides at the circus. Everything in the world reacts to forces. If it can't, it breaks. So, in order to make something good, and in order to be safe when doing it, you need to know about forces :-). Have fun.

How much do you know?
How many forces can you identify here? Watch the video below. Then write your answer in a table in your Keynote for this topic. media type="youtube" key="qqhlfz9GQPE" height="385" width="640"

Paper Plane Competition
In this competition you choose which category you wish to compete in. Research designs, or use your favorite. No weights or pointy planes allowed. Think about whether you will use fins and what effect they might have. After you have made your plane you need to take a photo of it and include it in your Keynote. If you are good at making movies, you can make a 30 second film explaining why you think yours worked well... or crashed. The best work will use the forces words you have learnt during this lesson.
 * 1) Longest flight
 * 2) Longest time in the air
 * 3) Best loop
 * 4) Best tricks

Winning work may feature on this website.

media type="file" key="107-103236-Paper Plane Competition 2.m4v" width="300" height="300" media type="file" key="107-103107-Paper Plane Competition 2.mov" width="300" height="300"

Giving forces names
Read Ch7 Forces pp. 127 - 130 of the text and complete the over-to-you questions on p. 131. in your KeyNote on Forces.
 * It is important that you write out your answers as full sentences so that they serve as notes for this section.
 * Any unfinished work is to be completed for HW.
 * Once you have finished all tasks in class can complete...
 * activity 5: table soccer: using a paper ball and an empty pen shell
 * activity 6: electrostatic forces using a pen, or texta and paper shreds
 * activity 7: gravitational forces: pencil case and paper
 * Before going on to the next task you need to answer the questions for each activity and include a photo of it in their KeyNote.



Newton's Laws
media type="youtube" key="cWOv7NyOnhY?rel=0" height="510" width="640" Find out what Newton's Laws are... Can you explain them in terms of an activity that you do?

Examples of great student work.



Learning Science through Toys : Professor Gupta media type="youtube" key="r8E5dUnLmh4?version=3" height="510" width="640"

Air Pressure
media type="youtube" key="CJe7kynqMCQ?version=3" height="510" width="853"

Friction
Mythbusters: phonebook friction media type="youtube" key="hOt-D_ee-JE?version=3" height="510" width="640"

Friction Prac
Using friction blocks and newton spring balances, test the effect of friction between the wooden block (or your pencil case) and a range of surfaces. Record your results in a table. Analyse these in class with your teacher.

Think about:

 * why some surfaces have more friction than others
 * how important friction is for control
 * how we can reduce friction and why this is important in other situations.
 * what you need to do to make sure your experiments are fair tests.

media type="youtube" key="GUwV1UMIAkQ" height="505" width="640"

Static Electricity
Use a Vandergraf generator to experiment with static electricity. Carry out these mini experiments and then explain what happened. Organise someone to take a photo and include both the questions, your explanations and your photos in your keynote. Join hands in a chain and see how many people the charge can travel through.
 * 1) What is happening and why does this work?
 * 2) Why does a spark transfer from the last person to whatever they touch?
 * 3) What happens when you add confetti to the generator?
 * 4) What happens when you add foil plates to the generator?
 * 5) Why do they behave differently?
 * 6) Where else have you experienced static electricity? Write a story about when you gave someone (or received) a big shock.

See if you can find the answers to these brain bafflers related to static electricity!
1. Explain why photocopiers need static electricity. 2. How do aeroplanes deal with the build up of static electricity? 3. Will I blow up if I wear a woollen jumper while filling up my car with petrol? 4. How is lightning formed? 5. Why does your hair stand up on a van der graph generator?

Will using a mobile phone at the petrol station start a fire?

Pressure from steam
=Echuca is famous for its paddle steamers.= Paddle steamers heat water in boilers. When wood is burnt it heats the water. When the water reaches 100 degrees celsius it turns to steam. Steam is a gas. In a gas particles move much faster than in a liquid. They therefore need much more room. So as water turns from its liquid form to its gas form it expands greatly. Steam engines use the pressure that the expanding water molecules create to drive engines. Paddle steamers use these engines to turn their paddle wheels and drive the paddle steamer up the river. CHUFF CHUFF CHUFF.

The evolution of steam engines

Paddle steamer excursion and prac.