T3-2

I have done some research few days ago, and I have found out that we can make the car go faster by wearing the elastic band on the wheels. (only the back wheels maybe. And Kimi asked about this idea to Mr Ward and he had confirmed with the idea that the elastic band would increase the friction between the wheel and the track so the speed will as well increase. Here are some other keys to make a car go faster:

• Lighter car goes faster/ use the lightest material. 
• Increase the friction between the rear wheels and track
• More mass over the back wheel, the less the rear wheels spin.
• Wheel goes faster without rubber.
• Use double sided tape to stick bearing under the chassis
• Lubrication / oil and grease
• Friction free for all the part touching
• Balance the wheels – sand down the wheels. 

T3-1

We have started the new unit now and assignment was introduced. On today's lesson, Mr Ward told us how to calculate the velocity and did some example questions together. The formula for velocity is V= displacement/time. The units have to be minute and second. So if the times are in minutes or hours, we have to transform them in to seconds and killometres or centimeters into meters always. Mr Ward also told us the difference between velocity and speed, distance and displacement. They are similar to each other, except that velocity and displacement have the direction.

Simplified definition of Velocity and speed:
speed: distance travelled in a second
Velocity: distance travelled in a given direction in a second.

Simple definition of distance and displacement:

Speed = distance travelled in a second
Velocity = distance traveled in a given direction in a second

Definition of distance and displacement:

1. Displacement is the directed line segment between initial and final position of a moving body.
2.Distance is the total length of path traversed by the moving body irrespective of direction.


http://wiki.answers.com/Q/What_is_the_difference_between_distance_and_displacement