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.