Question

Newton's second law of motion says that the mass of an object times its acceleration is equal to the net force on the object. Which of the following gives the correct units for force? a. Kg m^2/s^2 b. kg/m s^2 c. kg m/s^2 d. kg m^2/s e. none of these answers

Answer 1

Answer: Option (c) is the correct answer.

Explanation:

According to the second law of motion mass of an object times its acceleration is equal to the net force on the object.

Mathematically,     F = ma

Generally, mass is expressed in kilograms (kg) and acceleration is expressed as follows.

            acceleration = $\frac{velocity}{time}$

                                  = $\frac{m/s}{s}$

                                  = $ms^{-2}$

Hence, S.I unit of acceleration is $ms^{-2}$.

Therefore, units of force will be as follows.

                      F = ma

                         = $kg \times ms^{-2}$

Thus, we can conclude that $kg \times ms^{-2}$ gives the correct units for force.