Thursday, October 7, 2010

 

Thurs-Day 1

Physics - began our unit on Projectile (TWO-dimensional) Motion. We saw that freely falling objects, whether they are thrown horizontally or just dropped, will ACCELERATE towards the Earth (due to gravitational attraction) at the SAME EXACT RATE (neglecting any air resistance). So, firing a bullet horizontally from a gun, while dropping a bullet alongside the SAME gun, will cause the bullets to hit the ground at the SAME TIME because they are acted on by the SAME gravitational force VERTICALLY downward towards Earth; they will BOTH  be accelerated vertically downward at 9.8 m/s^2. The ONLY difference will be that the horizontally fired bullet will land some far horizontal distance away as it strikes the ground at the same time as the dropped bullet.

We then did used our vector addition knowledge from unit one to combine the vertical and horizontal components of a velocity to obtain a resultant velocity of a projectile that is freely falling, given an initial horizontal velocity (but no longer being pushed horizontally!).

AP Chem - continued our redox balancing process for both acidic and basic solutions.
See Blackboard for massive stoichiometry and redox balancing practice.



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