Physical forces are external objects that cause changes in the motion of other objects or stresses in stationary bodies. They have magnitude and direction and include gravity, electromagnetic and nuclear forces. They cause changes in motion and are interrelated.
Physical forces are external objects or agents that cause changes in the motion of other free objects or stresses in stationary objects or bodies. Quite simply, a force applies a push or pull to an object that causes it to change direction, change speed, or deform to some extent. Physical forces have magnitude and direction, which makes them, for mathematical purposes, vector quantities. There are many different types of forces, from simple physical objects colliding to complex electromagnetic fields that repel various objects. Scientists do not yet fully understand how forces work, as many, such as gravity, are intrinsically linked to the largely unknown field of quantum physics.
There are many different physical forces that have been observed and that are used in physics-related calculations. Applied forces are generally considered to be the simplest of forces. While most types of forces can typically be considered applied forces, the term is usually reserved for actions, often human, that directly push or pull on a system. Another common and important force is known as the normal force. Normal force is the equal force applied by an object, such as the floor, when another object applies pressure to it; this force is the reason people don’t sink into the ground when they walk through it.
One of the most important forces is gravity, which wasn’t identified as a force until the work of Isaac Newton. Gravity satisfies the definition of force because it causes a change in the motion of objects. A ball thrown in the air will, of course, return to the ground due to gravity. Electromagnetic forces are also commonly studied physical forces involving the pushes and pushes between differently charged objects.
Nuclear forces are an integral part of the study of physical forces, especially in the area of quantum physics. There are two main types of nuclear forces, the strong nuclear force and the weak nuclear force. The strong nuclear force is the force responsible for holding together the subatomic particles that make up the nucleus of an atom, and the weak atomic force is involved in the decay of subatomic particles.
There are many other types of forces as well. All physical forces, however, do essentially the same thing in very different ways and on very different scales. They cause changes, usually related to motion, in other objects. Many physical forces are interrelated and can have varying effects on each other.
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