whoops almost forgot :P. deriving equations 3 and 4!

So Equations 3 and 4 are basically what Mr.Chung calls "Twins" so they are basically the same except that one is  V_{1 and the other is} V₂


How to transform from Equations 1 and 2 to Equations 3 and 4:
Equation 1: V₂₌ V_1+at
Equation 2: d= ^1/₂  (V₂ -V₁ )t

3:

Sub (at) for (V₂ -V₁ ) from equation 2_: d= ^1/₂  (V₂ -V₁ )t   +    V₁ t

 d= ^1/₂  (at)t   +    V₁ t

  d= ^1/₂   a t²   +    V₁ t

 d=  V₁ t  +   ^1/₂   a t² 

4:

d= V₂ t - ^1/₂  (V₂ -V₁ )t
Sub (at) for (V₂ -V₁ ) from equation 2
d= V₂ t - ^1/₂  (at )t
d= V₂ t - ^1/₂  a t²

The graphs but switched....i drew them...

• This is the distance-time graph
• From the start, the object moved away from the starting point [E] by constant speed
• Then, it stopped for a while and walked towards the starting point [W] for few seconds
• Then, it stopped for the rest of motion
• 
  

• This is velocity-time graph
• The velocity was 0 for 2 seconds , this is the stopped motion
• The velocity was 0.5 after 2 seconds until 5 seconds ; this is the walking motion [E]
• The velocity was 0 at 5 seconds until 7 seconds; this is where there is no motion
• The velocity was -0.5 until ends ; this is the walking motion [w]

• velocity-time graph
• At first, the velocity was increased 0 to 0.5 until 4 seconds; this is the speeding motion [E]
• From 4 sec the velocity was constant until 6 seconds ; this is the constant speed movement [E]
• From 6 the velocity was -0.4 until 9 seconds ; this is the slower speed movement[w]
• Then, the motion stopped from 9 seconds.

• distance-time graph
• It started from 1 m , moved constant speed until 3seconds ; this is moving [E]
• Then from 3 to 7 seconds,  this is the rest motion 
• Then from 7 to 10 seconds ; this is the moving constant speed movement [E] 

• velocity-time graph
• At first the speed [E]was constant until 3 seconds and 4 seconds to 7 seconds, the speed was [W] constant then the motion stopped from 7 seconds

• This is distance-time graph , it started from 3 meters , this is the constant speed [W]
• Then it moved 3 seconds from rest motion until 4 seconds
• Then it moved 4 seconds at constant speed [W] until 5 seconds
• Then it moved 5 seconds at rest motion until 7 seconds
• Then it moved 7 seconds to 10 seconds at constant speed [E] to 3meters.

building motors with Tomeo and James :D

At first i found the process difficult due to our lack of supplies. However after Mr. Chong entered the room with all the supplies that we need, i was confident that we would succeed. we decided to work separately for the process to speed up. Our motivation was the bonus mark Mr. Chong mentioned for who finished first. It was much easier than i anticipated, the nails go in the wood easily and the cork was soft enough for me to place the commuters and the axle. the nails had to be 2 or 3 cm apart for one side. on the other side, there needed to be a distance of 5-6 cm apart. While i finished up the board, James finished sanding his coke can. then i used a small nail to make holes for the 2 paper clips. the paper clips were the support for the axle. Then when the cork was placed on the paper clips, and it was stable; we nailed the tin can strips on the sides of the board in front of one of the paper clips. Lastly, James wrapped the coil around the cork vertically and we sanded both ends so that it touches the can strips. In the end, we succeeded in being the first group to accomplish the difficult task. Our motor spun 4-5 times on the first trial. Here are pictures of our beautifully created motor:

 

Well we are also the first group to make our motor explode! enjoy this video of our motor working(almost) and another of our motor exploding! (almost)