Do Dimensional Analysis.

Dimensional analysis helps you to check your formula derivation. All terms in the equation should have the same dimension ( or units)

Example: The pressure p is defined as the force F per unit area A. Suppose you measure force in Newton N and length in m. What is the unit of pressure?

P = F/A. Since the dimension of A is length^{2}.
Thus pressure is measured in N/m^{2} .^{ }

Example: Which of the following formula has correct dimension?

- v = a t + x t2.
- v =x / t
- v = a x

Answer: v = x / t.