You are constantly pulling your colleagues toward you
In short: Every object with mass exerts a gravitational pull on every other object. While we usually only notice this when dealing with planets, the force exists between you and the person standing next to you. It is simply too small for our senses to detect in daily life.
The physics governing these interactions is defined by Newton's Universal Law of Gravitation. This principle allows us to calculate the specific gravitational force between any two objects based on their masses and the distance between them. The formula used is: force gravity = G × M × m / separation², where 'G' represents the universal gravitational constant. This law provides a framework for understanding why astronauts experience weightlessness in space.
To visualize the scale, consider two people standing one meter apart in a corridor. If one person has a mass of 60 kilograms and the other has 70 kilograms, they exert a mutual gravitational pull of approximately 2.8 × 10⁻⁷ newtons. This equates to about 0.28 millionths of a newton—a force so minuscule that it is effectively imperceptible in practice. The calculation assumes the distance is measured from center-to-center between the two bodies.
The reason these everyday forces are negligible is the extremely small value of the gravitational constant, G, which is approximately 6.67 × 10⁻¹¹ newton square metre kilogram⁻². For gravity to become significant enough to notice, at least one of the objects involved must possess a very large mass. Because of this constant's tiny magnitude, gravity remains hidden unless massive celestial bodies are involved.
We can see this principle in action when we look at Earth. Because the Earth's mass is so massive (about 6.0 × 10²⁴ kilograms), it exerts a measurable pull on smaller objects. By applying Newton's formula, one finds that gravity exerts a force near 9.8 newtons on a 1 kilogram object at Earth's surface, matching our observed value of approximately 10 N. The radius of our planet serves as the specific separation value for these surface calculations.
Opens the Intellect+ feed with this card first. Swipe up for the next one.
Sources
- Summary by Intellect · source: Calculating the Gravitational Force
- Also: Calculating gravitational forces
To cite this card, link to https://intellectplus.co.uk/app/science-calculating-the-gravitational-force.
How we source, check and correct cards: Editorial standards.
General information, not professional advice. Spotted an error? Flag the card or see corrections and complaints.
Intellect Plus is a visual educational discovery platform for exploring fascinating facts and ideas. Brain Food, Not Brain Rot. What is Intellect Plus?
Related
More in Physics · More in Science · Latest · A–Z · All topics
