PHYSICS – We finally made it to the end of chapter 3! Here’s the lecture from Monday on relative motion. I went ahead and posted a lesson from last year – it has a bit more info on it (and I think there is an angular projectile motion problem at the end).
You know, we’ve done most of this already. The only new part is the motion of objects in the same direction and opposite directions, relative to each other. Don’t forget, you’ll use what you learned about vector addition to work those “boat goes across a river” and “plane experiences a head wind” types of problems.
In case you didn’t get them in class today, here are the answer to tonight’s problems. Also, here is the Vector/Projectile Motion Worksheet if you want to get a head start. Help session tomorrow morning, 7:15ish.
37) 80 m; 210 m
43a) 10.1 m/s at 8.53° east of north; b) 48.8 m
44a) 14.1° north of west; b) 199 km/h
45) 7.5 min
46a) 23.2° upstream from straight across; b) 8.72 m/s across the river
flickr photo by raysto