Question

1. the formula for gravitational force is:

a) f = ma
b) f = gm1m2/r²
c) f = mv²/r

Explanation:

• Option A: $F = ma$ is Newton's second law of motion, relating force, mass, and acceleration, not gravitational force.
• Option B: $F = \frac{Gm_1m_2}{r^2}$ is Newton's law of universal gravitation, where $G$ is the gravitational constant, $m_1$ and $m_2$ are the masses of two objects, and $r$ is the distance between their centers. This is the formula for gravitational force.
• Option C: $F = \frac{mv^2}{r}$ is the formula for centripetal force, which is the force required to keep an object moving in a circular path, not gravitational force.

Answer:

B) $F = \frac{Gm_1m_2}{r^2}$