Unit 7

Today we did a couple of activities. The picture above shows one of the examples we completed. Two people threw a ball back and forth on a "danger" board and a hover board. Depending on the persons mass they could stay stationary or move back a bit.

Today we also reviewed what we learned yesterday, which was all about momentum (p)
Equation to find momentum : p= m (mass )v (velocity) and momentum is a vector quality.
Impulse is change in momentum and to find the change in momentum you can use this equation : change in momentum=(force)(change in time). We reviewed the law that can be called the law of conservation of momentum which states that in a closed system momentum of a system is always conserved. The unit for momentum is kg•m/s. Another thing that we learned today is that the area under the curve of a force vs. time graph is impulse. The problems that we went over all involved the equation : change in momentum = avg force • change in time. The change in momentum for this equation is momentum final - momentum initial. Also problems like these require you to write a axis, because just like the cart lab that we did in class going one way needs to be positive and going the other way needs to be negative.

Other things we learned today are that forces between two colliding objects of different masses on each other are the same, impulses between two colliding objects of different masses are also the same. Changes in momentum are the same because changes in momentum equal impulse. Changes in speed are different though.