Week of december 14th

this week we learned about Newton's third law.  

The law says that every action has an opposite reaction.  

We proved this when Laura and I did an experiment.  

We both sat on carts.  

Then i pushed as hard as i could on laura's knees.  

Instead of having laura just move back, i did too because she pushed back on me.  

Even thought she didn't really notice she was pushing, she was, because i moved back.

If she didn't push on me then i wouldn't have moved.  

We also saw Mr. Finley do an experiment.

He was standing on a cart and pushing or pulling on the door handle.

When Mr. Finley was on the cart, he tried to open the door but the force of the door pushed him away. 

When he was holding the door shut, the force of the door made him come towards it.

What is the real world application? 

- It shows that no matter what force it is, there will always be something pushing back on you.  Also there is always the earth's force which is gravity.

the week of december 7th

What did we learn this week???

• We learned all about weight and mass. 
• Mass is a measure of how much matter an object has. Weight is a measure of how strongly gravity pulls on that matter.
  
• we also talked about our weight changing in an elevator. (we saw a video clip on that with a girl who was 97 pounds in  an elevator and her highest weight in the elevator was 105 pounds and her lowest was 87 pounds. this shows how much the weight can differ depending where you are)
• we talked about weight on the moon too.  Since there is not a lot of gravity pulling you down, you practically float. You weigh a lot less too!
• we did more force diagrams this week, and we paired them with motion diagrams.
• For one of the homework assignments we talked about people pulling carts in different directions and the unbalanced forces of that.
• We also did an experiment and i was one of the testers/volunteers.
• the experiment was that me and laura pulled mark that was holding on to the rope that we were  pulling and he was sitting in the cart. Laura and i had to stay at the same speed the whole time or the experiment wouldn't work.  Then we added John-robert onto the cart (i think) and it was even harder to push, so they accelerated slower than the first time. To make it even harder aage hopped onto the cart and they hardly moved at all.  That shows that the greater the mass the less acceleration. And the less the mass the more the acceleration. And the greater the force the greater the acceleration.  Which also means that the less the force the less the acceleration.

How did we learn these ideas???

• We learned this by watching the video clip and doing the experiment that i just explained above.

Why are these ideas important???

If you see someone pushing a car to get it started you will know how hard it is to do because you will know what forces are pushing against the car and the person.

week of November 30th

On monday:

-we had a test on Tuesday so on Monday we had a review.

On Tuesday:

-we had the test (i hope we get it back soon!!!!)

On Wednesday:

- we learned about force diagrams.  

-Mickey was holding a basketball and a bowling ball(which i helped him hold.. thank you very much!!!!!!!!!!!!!!!!!!!!!)  he was pushing harder to have the bowling ball stay up than he was on the basketball because the bowling ball was a lot heavier. 

-we learned how to make force diagrams.  We made a force diagram for the house on the hand.

-we also learned that the earth always has a force on any object. The force is called GRAVITY.  :] big word!!

On Thursday:

-We learned that you can have more forces going one way.

-We also wondered if the table applied force???.. Our conclusion is that yes, the table does apply force.  It applies it on the ground.  it is also pushing up because it supports any object that goes on it. 

-The last thing we did was watch Mr. Finley pull Adytia on the ground. 

The forces were:

             -the surface of the ground pushing up

             - the earth (gravity) pulling down

             - mr.finley's hand

On Friday:

- WE PUSHED MR.FINLEY'S CAR!!! AHHH 

- we went outside and pushed mr.finley's car. This would help us understand about forces. When people pushed at the same time the car did not move but when we were all on one side of the car the car went pretty far!!! (we are strong!) 

-and poor mickey!! his foot got runover by the car!!!:( haha

What science ideas did i learn?

-I learned all about forces and force diagrams.  And we learned how to write math expressions and pictures.  We also learned how to label the force diagrams correctly.

Why is it important to learn this?

- It applies to a lot of real life situations.

- Force is how you know which object is heavier, so if you want to know if you can lift something heavy then you would have to be able to apply enough force.  

okkay thats all...

byee

-------------Kathy----------------