The strong nuclear force, also called the strong nuclear interaction, is the strongest of the four fundamental forces of nature It’s 6 thousand trillion trillion trillion (that’s 39 zeroes after 6!) times stronger than the force of gravity, according to the HyperPhysics websit

Together, these universes comprise everything that exists: the entirety of space, time, matter, energy, information, and the physical laws and constants that describe them The different universes within the multiverse are called “parallel universes”, “other universes”, “alternate universes”, or “many worlds”

All of the forces we experience every day can be reduced to just four categories: gravity, electromagnetism, the strong force and the weak force Now, physicists say they have found possible signs of a fifth fundamental force of natur

New evidence suggests a tiny subatomic particle could break the known laws of physics, hinting at the existence of a fifth force of nature When doing this, the team found the muons wobbled in unpredictable ways, defying the fundamental theory of how particles interac

Newton’s law of gravitation, statement that any particle of matter in the universe attracts any other with a force varying directly as the product of the masses and inversely as the square of the distance between them

A force is a push or a pull that acts upon an object as a results of its interaction with another object These two forces are called action and reaction forces and are the subject of Newton’s third law of motion Formally stated, Newton’s third law is: For every action, there is an equal and opposite reaction

Inertia, property of a body by virtue of which it opposes any agency that attempts to put it in motion or, if it is moving, to change the magnitude or direction of its velocity Inertia is a passive property and does not enable a body to do anything except oppose such active agents as forces and torques

The more mass an object has, the greater its inertia and the more force it takes to change its state of motion The amount of inertia an object has depends on its mass – which is roughly the amount of material present in the object

Balanced forces are equal in size and opposite in direction When forces are balanced, there is no change in motion In one of your situations in the last section, you pushed or pulled on an object from opposite directions but with the same force

Here are some examples of situations involving balanced forces

• Hanging objects The forces on this hanging crate are equal in size but act in opposite directions
• Floating in water Objects float in water when their weight is balanced by the upthrust from the water
• Standing on the ground

The force of gravity pulling downward and the force of the table pushing upwards on the book are of equal magnitude and opposite directions These two forces balance each other If two individual forces are of equal magnitude and opposite direction, then the forces are said to be balanced

Balanced forces do not change the motion of an object If an object is in motion, it will keep moving in the same direction and at the same speed if the forces acting on it are balanced