3-25

It is Wednesday, March 25. Today’s agenda: Demo’s and videos, discuss results, and a projectile trajectory activity. On the way into class, everyone picked up page 6. Mr. Manning started off today’s class with a few exciting demos. First, he demonstrated how to do the “try it” part of yesterdays worksheet: holding a bouncy ball at shoulder height while walking at a constant velocity. He only revealed that the ball must stay with you at your constant speed due to inertia. Then Mr. Manning had a track and a cart ready to go with a ball in it. The idea was to push the cart on the track until it reaches the launching point. The ball is then launched into the air. The ball always came back and landed back in the cart even while the cart was moving.

Then he tried to make things more interesting, he created a bridge while he was staying after school one day. As the ball was launched, it was supposed to go over the bridge and back into the cart like the first time. We tried this several times and it did not work. Matt suggested that it the bridge was being dragged along with the cart as it moved and that was why it wouldn’t work. Then we took a look some videos of horizontal motion and vertical motion. The one video was of a snow mobile (captioned) launching a flare. Joey raised his hand, and asked what a snaow mo-byle, because he was unfamiliar with the term. Mr. Manning explained that he might not be familiar with it because it was used more in the west. After that issue was cleared up, we learned that **projectiles will always move at a constant horizontal speed** (except with air resistance). We then worked on page 6 for the rest of class.