Lower case "a" usually stands for acceleration.
What else can it mean?! You! YOU! YOU!!!
time
Mega joules.
perpetual motion
Velocity/speed.
Velocity/speed.
Probably: The Antiproton Decelerator A machine to cool down antiprotons at the CERN physics laboratory.
In most equations, it stands for "energy"
The full form of the word physics is physics. It does kind of sound like it derives from the word physical science or physiology or something but it doesn't.
PHYS stands for physics in college courses.
I would type it but I don't have the energy.
Let's take just one example from your question: Physics. If you aren't excellent in math, you don't stand a chance in physics.
If Larry gets a 70 on a physics test where the mean is 65 and the standard deviation is 5.8, where does he stand in relation to his classmates