Cells homework

I know you've done this with Miss Chandarana, but this video is a great piece of revision material. If you can tell me how many cells there are in a human body (in the first part of the video) I'll give you an achievement point.

Safety features in cars

Today we're going to talk about the last section of the physics unit we've been doing, car safety features.
Complete the following activities:

1. Copy the formula for calculating impact forces here. 
2. If you increase the stopping time, what happen to the force of impact?
3. What features in cars help increase the stopping time in a collision?
4. Try this quiz, writing down the answer to number 3. 
5. Explain why there used to be a higher percentage of fatalities in car accidents than there is now.
6. Using the link above, explain how a crumple zone works as an important safety feature in modern cars.
7. What did James Ryan invent? How did it help car safety?
8. Using the picture below, explain how an air bag helps people avoid injuries. What does it increase?
9. Watch this video, and explain how this new feature might help make people safer. Why might people be against using this technology?
10. Watch this video and list each of the features you can see at work.  What do they all have in common?

11. What could you change to expose these dummies to lower forces?

12. Why does the cannon move backwards less than the cannonball moves forwards?

Progress test revision

This link comes via Mr. Lawrence, and is a teacher explaining different parts of the additional science curriculum (what you're doing at this year). You can choose playlists and skip to the relevant bits for help with answering exam type questions.

Bitesize has some good revision stuff too, try these pages for notes, activities and tests:
Biology 2.1
Biology 2.2
Chemistry 2.1
Physics 2.1
Physcics 2.2

Chemistry 2.1

Today we're going to run through the chemistry section for the test next week. If you understand how the two types of bonding are different and can draw covalent bonds, you have met the objectives for this lesson. 

HOMEWORK
Complete the work on the sheet at this link, thinking about how covalent and ionic bonds are different. use the other links from the questions below to help you if you get stuck. 

1. Explain what the 'groups' of the periodic table are.
2. Explain how electrons are organised around atoms - how many go in each 'shell'?
3. What happens to lithium to change from an atom to an ion?
4. Briefly summarise the characterisitcs of ionic bonds and covalent bonds.
5. Draw a covalent bond between 2 chlorine atoms.
6. The diagram below shows the charge on an ion of each element. If group 1 is +1, have they gained or lost an electron? Think about what charge an electron has:                                                         
7. Try these two tests (here and here), writing down how  many protons, neutrons and electrons an atom of Al has.      
8. Using the periodic table below, give an element with a +1 ionic charge and one with a -2 ionic charge.                                                                   
9. Extension - In what ratio would Mg and Cl join to from a compound with a balanced charge? What type of bonds would form? Explain your answer.
10. Once you're finished, try this activity.