Cracking the SAT Physics Subject Test

Third, combine the force vectors and determine the net force:

This will require you to use the

Superposition Principle (for vectors)

Vtot = V 1 + V 2 + ... + Vn

When superimposing forces we call this the superposition of forces. From the
previous example we determine our net force as follows:

Fourth, the math:

In this case,

Fweight = Fnormal

Fnet = ma = Fpush − Fnormal

Questions 15-16