Wednesday, February 22, 2017

speed lab ball bearing


The Effect of Gravity on Speed
 Introduction
Gravity provides a constant acceleration (force) on an object.  The effect is changed by using ramps at different angles. In this lab, you will find the optimal angle to maximize acceleration on a ball bearing so it travels the farthest and/or the fastest.  Friction is the opposing force created by the surface interactions.  Whenever something rolls due to a force, friction will oppose this force and slow it down.

Equipment needed:
Timer                                       Ramp                           Ball Bearing
Graph Paper (2)                       Ruler                                      

Procedure:
1.         Put the ramp against the seat of a chair.  Place the ramp and chair so that the ramp points towards the hallway.  Have your teammate on the other end of the hallway. 
2.         Place the ball bearing at the top of the ramp.
3.         Lift the ramp 20 cm and release the ball bearing
4.         Time how long it takes to travel  5 meters.
5.         See how far it will go..
6.         Repeat the experiment three times for each height then do 40 cm, 60 cm, and 80 cm.

Height
Time to travel 5 meters
Distance travelled
20
 2.98 s
 5 m






40
 3.66 s
 5 m






60
 8 s
 5 m






80
 6 s
44 cm 







Observations: When the height is high, the time is short, the height is low the time is long

 Analysis
1.         Describe how the ball rolls off the ramp at each height—discuss the effect of bouncing or other factors.
            
 : When the height is high the ball will bounce and the distance also shorter than the ball that doesn't bounce.

2.         Discuss what is the fastest speed reached and any factors that could improve this.
:  2.98 s


3.         Does the ball travel in a straight line, why or why not?
:  No, because it is circle so it can go anyaway.










Wednesday, February 8, 2017


     Essay

                      This year is 2016, I have done a lot of things. This year I              have start studied in Panyarat high school. I have a lot of                 good friends. They are always help each other. In next year I           plan to more diligent in learning and speak less in bad words.

Wednesday, February 1, 2017

Cloud

                         

Cloud

       Stratus: The gray cloud that covers skylight rain and drizzle.




      


Cirrus: Feathery cloud, good weather but rain or snow may be on the way.






     Cumulus: Fluffy white clouds fair (good) weather







Thursday, November 3, 2016

Global warming

                                                                                   
                              Global Warming

    The cause of global warming is also depend on the numbers of population. That is because if population increase so the numbers of house and food also increase ,then need to cutting down of forests to make more space to housing.

      The global warming give many effect to animals and human, increase the temperature. A lot of animals were die because they cannot adapt in that hot weather. Human also get sick because the weather were change fast.
      
       This cause actually we can help to cure it in many ways for example plant the trees. It very help us to decrease global warming because it is not only give oxygen but also take in carbon dioxide.

Thursday, September 1, 2016


                                            Food Chain
Producer: Grass
Consumer: Ants
Secondary consumer: Bird






Thursday, August 25, 2016

Symbiosis Poster


Image result for symbiosis



                                                              Symbiosis Poster
            My group has Bright, Kiwi and Me. We need make a poster of symbiosis and in that poster we must explain what is symbiosis. Then write about the three type of symbiosis that is Parasitism, Mutuatism and commensalism then give the example of each one. After that decorate the poster. This poster also need to be A3 paper




Thursday, July 28, 2016

Science topic



                                                                   Science topic
     
           


            My favorite activity is terrarium because we have to feed fish and shrimp for 2 or 3 weeks a bottle. But my group was die since the first week of an experiment. I think that is because we didn't open the bottle cap so maybe it doesn't has enough oxygen.