We worked on Free Fall part 3 in class to practice our understanding of objects being thrown into the air.
We learned that for an object being thrown into the air, \( \vec{v}_f_y = 0 \frac{m}{s} \) at the top.
We also learned that there is symmetry for an object being thrown from the ground and landing back on the same ground. Symmetry of a projectile \( \Delta t_{up} = \Delta t_{down} \) \( \vec{v}_{i_{y~up}} = -\vec{v}_{f_{y~down}} \) \( \Delta \vec{y}_{up} = - \Delta \vec{y}_{down} \) Homework Due 10/14/14 Group Practice - Free Fall 2 We learned how to find the displacement when we have a constant acceleration.
Displacement w/ acceleration \( \Delta \vec{d} = \vec{v}_i ~\Delta t + \frac{1}{2} ~\vec{a} ~(\Delta t)^2 \) Homework Due 10/6/14 GP - Displacements and Final velocities We learned how we can draw the velocity vs. time graph and acceleration vs. time graph if we have displacement vs. time. We also learned how to get any graph from any other.
Homework Due 10/2/14 Graphing Worksheet #2 We discussed how to take our average acceleration equation and change it algebraically so that we could make another useful equation -- the final velocity equation.
Final Velocity \( \vec{v}_f = \vec{v}_i + \vec{a}_{avg} \Delta t \) Period 1 Lab Lab # 3 - Cart on a Ramp We learned about how velocity can change. Velocity can change by: 1) Speeding up 2) Slowing down 3) Changing direction We can think of acceleration almost like pushing and pulling. We decided to call the thing that changes velocity -- acceleration. Average Acceleration \( \vec{a}_{avg} ~ = \frac{\Delta \vec{v} }{\Delta t} ~ =~ \frac{\vec{v}_f - \vec{v}_i}{t_f - t_i} ~~~~~~~ [\frac{m}{s^2}] \) Homework We learned about motion, that everything is always changing, and that nothing remains the same.
We learned the 5 step method to solving physics problems, and also learned some new equations. displacement \( \Delta \vec{d} = \vec{d}_f - \vec{d}_i ~~~~ [m]\) change in time \( \Delta t = t_f - t_i ~~~~~~~[s] \) Average velocity \( \vec{v}_{avg} = \frac{\Delta \vec{d} }{\Delta t} ~~~~~ [\frac{m}{s}] \) |
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February 2015
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