Cannon~

A cannon is any piece of artillery that uses gunpowder or other usually explosive-based propellants to launch a projectile. Cannon vary in caliber, range, mobility, rate of fire, angle of fire, and firepower. (if you are interest in details of cannon;s function, and structure. please go to google.com and simply type cannon inside.)  but how can the cannon fire the heavy gun powers to a few kilometers away? well, that is the magic of physics.
and the most exciting thing is, we are actually building a cannon in our physic class, of course a mini mode.

here are some pictures of a cannon.

FMA Lab

The FMA Lab is basically a lab that help us to understand the relationship between Force(F),Mass(M),and acceleration. to done this lab, a very cute little cart is required. and we find out the relationship between Force, Mass, and Acceleration by add weights in side the little cart and add the weight to pull the cart out of table. we learned the newton's second law, Fma through this lab, although this lab is exactly very fun...but, after go through all the difficulties, finally. we find a conclusion from this lab, Mr. Chung write it on the board....

The Tower ............

 A activity was held in our physic class room 2 weeks ago, construct a tower using newspaper and limit amount of tape. oh, forget to mention that the tower must be as high as possible, and it must be able to stand. some group make the tower really high, but the tragedy is, their tower wouldn't stand after all....OK, that's the situation in my group.It is a nice tower except it wouldn't stand. Anyway, even if we failed, we still have the fun and experience, and that is the most important thing during our education, right?(OK, i always use this sentence comfort myself after i fail something.)

here are some picture we have

Tallest structures in the world

   The tallest man-made structure in our world  is Burj Khalifa, a skyscraper in Dubai that reached 828 m (2,717 ft) in height on 17 January 2009. The  CN Tower  in Toronto, Canada, standing at 553.3 m (1,815 ft), was formerly the world's tallest completed freestanding structure on land. Opened in 1976 and unfortunately it was surpassed in height by the rising Burj Khalifa on 12 September 2007.  and of course there are some others pretty tall structures in our world that are not mentioned above.

but if you observed these structure more closely, it was very obvious that they all ave one thing in common, that the base of their structures are always wider than their tops. in fact, most of these buildings are in a  somewhat   cone shape , which help them to stand. Tomorrow our Teacher, Mr.Chung will ask us to build a structure with only newspaper. and the highest will won, what a exciting class and what a waste of newspaper.

Questions on projectile Motion

    Our interesting, somewhat handsome, evil physic teacher Mr.Chung asked us to blog some of the projectile motion questions he gave us. there are 5 type of projectile motion in total for grade 11 physic according to Mr. Chung's word. some of the questions are really straight forward, and some are little tricky to handle. but i don't think Mr. Chung will leave us alone with only this amount of work, this might only be the beginning............
Anyway, here are some of the answers to the questions on the projectile worksheet.
more questions will be posted afterwards :

How to build an egg glider?.

A new project  was given to us by Mr. Chung, that is, building an egg glider that is strong enough to protect the egg from breaking if the egg are going to be dropped to the ground from second floor.  Mr. Chung said that this will be helpful for us to learn kinematics and motion. but the task he gave us seems to be impossible to complete. we will only  be given 25 straws, one sheet of newspaper, and a limited amount of tape to complete this egg glider within 70 min. but since we are human, the most intelligent species and the ruler of this planet for over 6000 years . we can always solve the problem by using our brain. so, after 70 minuets of work, our group come a out a wonderful egg glider which are perfect in everything except of that it's ability to protect the egg is still unknown.
Anyway, here  are materials we used to build our egg glider:
you will be surprised when you see our outcome~

     Mr. Chung asked us to blog one of our homework on the blog,  which I think is totally unnecessary, to show my "creative" writhing on the blog and for everyone to see. anyway. here is my work on the following question : Page 72 #54,#56#58,#60,#62,#62. six question in total, right?

    If you see any mistake, it would be very helpful for you to kindly inform me and show me the correct method. Thank you and your action will be appreciated.

    Also , due the tectonically difficulties, some pictures are up-side down. so please cop and paste them into Word documents and read if you want to read about the details. sorry about the inconvenient.

    Here are the Answers :