the purpose of sin and cos in physics (and how do we choose which one to use)

Question

I’m a senior in high school and I don’t know how to choose sin or cos in physics problem. For the most part I memorised them. For example, why is the flux of a magnetic field = BAcos(angle) and why is the electromagnetic force = ILBsin(angle).

The last two years weren’t normal as we studied online so it’s highly appreciated if someone can eli5 and fill in the gaps for me.

In: 4

Answer 1

The simple answer – what is the value with an angle of 0? If the value is low when the angle is zero, the formula will use cosine. If the value is high when the angle is zero, you’ll use sine