June 25, 2012

Today, we began the day with the Newtonian Analysis of motion and the PGA:

1. Engage in force analysis - add forces acting in same direction, subtract forces acting in opp. direction
2. Find net force
3. This F[net] leads to accelerations

*Forces are vectors: + right/up, - left/down

After the break, we went onto the fan cart lab in which we examined the relationship between force, mass, and acceleration.
We derived an equation that related all three together: F = ma where as the mass increased, the acceleration decreased, and the force stayed constant.


Newton's 1st law:
Forces are balanced - v=0m/s^2 obj at rest, a = 0m/s^2, stays at rest
                                - v doesnt = 0 obj in motion, same speed, same direction

Newton's 2nd Law
Forces are unbalanced - there is acceleration - acc proportional to force
                                   - acc inversely proportional to mass

Big Ideas:
- To keep moving @ the same speed in the same direction, you dont need any force (Net)
-F(net) = Ma
- F(net) = M x (change in v/change in t)
-Force(net) required Change in V