The electromagnetic force is the second strongest force. This is the force that makes up matter in the universe. The movement of gluons creates a strong force between quarks. Gluons are smaller elementary particles, which have no substructure, and move between quarks as force carriers. Quarks form neutrons, protons, and other larger particles. This force is carried by gluons and binds quarks together to form larger particles. It acts upon the elements of the nucleus of the atom, keeping neutrons and protons together. The strong force is the strongest of the four forces. Unlike electrical and gravitational forces, strong and weak forces affect matter on the nuclear level only. All the other forces are subsets of these four. There are four fundamental forces in nature: strong, electromagnetic, weak, and gravitational. Fundamental Forces in the Universeįorces in nature cause objects to move or to stay in place. This type of equilibrium is called dynamic equilibrium, while the one with the object at rest is called static equilibrium. This model was later corrected to include objects moving at a constant velocity when the forces are in equilibrium. According to his model, if the net vector sum of the forces acting upon an object is zero, the forces are in the state of equilibrium and the object is stationary. One of the first scientists to investigate forces and to create a model of their interaction with matter in the universe was Aristotle. One newton corresponds to the net force that accelerates an object with the mass of one kilogram by one meter per second squared. The net sum of these forces is zero, they are in equilibrium, and the stone is not moving. The force of gravity is still pulling it down, but at the same time the normal force, or ground reaction force, is pushing the stone up. The stone from the earlier example may roll after it hits the ground, but it will eventually stop. In this case, the object would be at rest.

When several forces are acting on an object and pulling it in different directions, these forces may be in equilibrium, meaning that their vector sum is zero. During the impact, it bends the blades of grass that it falls on - the force of the weight of the stone is making them move and change their shape.įorce is a vector, meaning that it has a direction.

For example, when a stone is released, it falls down because it is pulled by the Earth’s force of gravity. Physics defines force as an influence that changes the movement of a body, be it external movement or movement within the body, such as changing its shape.

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