Reflection Chenbo

What I learned...

We studied vector dynamics and equilibrium during this period. Vector dynamics is about the effect of forces on motion. We use Fnet=ma to solve questions. When there is one object on the flat surface and the other one lean to a side, when m1g > m2gsinθ; system will move in m1 direction. When m2gsinθ > m1g; system will move the other way. Also if the surface has friction, we need to calculate the friction and than use m1g-friction. Then we can get a, if the question asks the tension,we can use T-F1or F2=m1or m2a, if the system move in m1 direction,then a should be negative.
When all the forces that act upon an object are balanced, then the object is said to be in a state of equilibrium. For equilibrium, we use w=mg and use sin, cos and tan to get the tension. Also F left= F right, F up= F down.

Difficulties
For vector dynamics, at the beginning, I will forget to solve for the friction, and also I am not sure to use sin or cos, but it gets better after practice. For equilibrium, I don't know how to draw diagrams at the beginning. It confused me for long time, it's not hard for me now, but I also need to take some time. After drawing a free body diagram, the questions are easy for me.

Problem-solving skills
I am good at vector dynamics, because it's easy for me to draw the diagram and it actually only uses one equation Fnet= ma. We can use it to solve all kinds of vector dynamics questions.