Visualizing Forces in equilibrium

[----md]

Hi,

I am studying for the MCATs, and currently going through physics. Sadly its my weakest area :(
For the last three weeks I am stuck on conservative/non-conservative forces. The problem seems to be that I keep missing important associated forces on a system.
For example:
I got stuck with problem 62 and 42 here: http://www.astro.queensu.ca/~tjb/hw/P10706/hw6.pdf

The problem? for 42- I simply didnt include the F of the engine in the free diagram- and all other forces canceled out.
For 62: I assumed that for the skier to be able to continue straight the final KE just has to be greater than the Centripetal force. Skipped over the fact that I can just make mg= mv^2/r and then solve the work energy equation. I had a couple of similar "ahh" moments with other force problems.

Soooo- Any tips for specific exercises/problems/ approaches to make sure that I don't miss key aspects of the system??
Thanks

 

[Valerie Park]

in advance!When studying for the MCAT in physics, it is important to pay attention to all of the forces and associated forces that are acting on a system. Make sure to include all of the forces in your free body diagrams, as this will help you to determine which forces are acting on the system. Additionally, understand the equations that are associated with each force, and how they interact with one another. For example, in problem 62, you should have used the equation mg=mv^2/r to solve the work-energy equation. Additionally, make sure to keep track of what is happening in the system and how it affects the outcome. This can be done by making a flowchart or timeline of events and noting any changes in energy, velocity, etc. Doing this can help you to identify any missed forces or other factors that may be affecting the system. Finally, practice as much as possible. Doing practice problems and working through different scenarios can help you to become more familiar with the concepts and forces associated with them. You can also use online resources to help you better understand the material and connect with other students who are also studying for the MCATs.