# How to calculate force of gravity

The force of gravity is an essential concept in physics, which plays a significant role in our daily lives. From holding us down on Earth to the planetary motion in the solar system, the force of gravity is responsible for numerous phenomena. For those who are curious about how to calculate this force, this article will provide step-by-step guidance.

**Understanding Gravity**

Gravity is a natural force that attracts two bodies with mass towards each other. It acts on all objects with mass without any direct contact between them. Sir Isaac Newton described gravity mathematically in his law of universal gravitation, which states that every particle in the universe attracts every other particle with a force proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

**The Gravitational Constant and Equation**

To calculate the force of gravity, you must first understand and apply Newton’s law of universal gravitation. The equation for this law is:

F = G * (m1 * m2) / r^2

Where:

– F represents the gravitational force between two objects

– G is the gravitational constant (6.67430 x 10^-11 N(m/kg)^2)

– m1 and m2 stand for the masses of two objects

– r denotes the distance between the centers of mass of these two objects

**Calculating Force of Gravity – A Step-by-Step Guide**

Step 1: Identify necessary information

First, determine the information required to calculate the force, including both masses (m1 and m2) and the distance between their centers (r).

Step 2: Calculate mass product

Next, calculate the product of both masses (m1 multiplied by m2).

Step 3: Determine distance squared

Calculate the square of r (r multiplied by r), which gives you r^2.

Step 4: Calculate the force of gravity (F)

Finally, apply Newton’s gravitational equation stated above. Multiply the gravitational constant (G) by the mass product and then divide this result by the distance squared to find F.

**Example**

Imagine you’d like to calculate the gravitational force between two objects: one with a mass of 75 kg (m1) and another with a mass of 50 kg (m2). The distance between their centers is 2 meters.

Step 1: m1 = 75 kg, m2 = 50 kg, r = 2 meters

Step 2: Mass product = m1 * m2 = 75 * 50 = 3750 kg^2

Step 3: Distance squared = r ^ 2 = 2 * 2 = 4 meters squared

Step 4: Gravitational force (F) = G * (mass product / distance squared) = (6.67430 x 10^-11 N(m/kg)^2) * ((3750 kg^2) / (4 m^2)) ≈ 6.26 x 10^-8 N

In this situation, the force of gravity between these two objects is approximately 6.26 x 10^-8 N.

**Conclusion**

Calculating the force of gravity can be simple when following these steps and using Newton’s law of universal gravitation. By mastering this concept, you’ll have a greater understanding of how gravity influences various phenomena that impact our world.