To all A level Physics students:
the key concept to Physics is just about forces. Nothing but
forces.
Look at your Mechanics. Kinematics is about acceleration which
comes from forces (F = ma). Dynamics and forces are obviously on
forces. Moments is about the turning effect of the force. Circular
Motion is about the centripetal force. Oscillations is about the
how the force is always opposite to the displacement. Gravitation
is about forces of gravity.
Remember force is a vector, and it can be resolved into at least
2 directions. (Brush up your basic trigo).
Physics in a Nutshell for Os and As
When in doubt, just resolve into parallel and perpendicular
directions, then resolve all forces in the parallel direction,
resolve all forces in the peprpendicular directions, then finally
vector sum them together using pygathoras theorem and trigo.
Do try to see the general picture of Physics, and understand it
through forces and vectors. Most of the topics are inter-linked,
and if you can catch this general gist, you will be able to do most
of the questions.