Non-contact forces

Contact and Non-Contact Forces

16. Contact & Non-contact Forces

Force and Motion: Magnets can push or pull without touching (non-contact forces). Magnetic Fields: The strength of magnetic forces depends on the distance between objects. Poles: Opposite poles attract, while similar poles repel.

Notes on Forces from Transcript (Contact vs Non-Contact; Systems/Agents)

Fundamentals of Forces and Vector Properties A force is an interaction that influences the physical state of an object. Forces are categorized as vector quantities, which means that the direction in which they act is important alongside their magnitude. Forces are measured in newtons ($$N$$). Because a force is a vector quantity, describing any force requires specifying both its numerical magnitude in newtons ($$N$$) and its direction of action. Classification of Forces: Contact and Non-Contact Forces are divided into two main categories depending on whether physical contact occurs between the interacting objects: contact forces and non-contact forces. A contact force is defined as a force that exists between objects that touch. Conversely, a non-contact force is defined as a force that exists between objects even if they are not touching, enabling interaction across a distance without physical surface contact. Effects of Forces on Motion and Shape Forces acting on an object can produce physical effects categorized into changing the object's motion or changing the object's shape. Forces acting on an object can change its motion in four distinct ways: by speeding it up, by slowing it down, by changing its direction of movement, or by causing it to rotate. Forces acting on an object can also change its shape. The three specific ways a force can alter an object's shape are by stretching it, by squashing it, or by twisting it. Resultant Forces and Free Body Diagrams When multiple forces act upon a single body, their combined effect is analyzed together. The overall effect of a set of forces acting on an object is represented by a single resultant force. To analyze and represent the forces acting on a system, a specific structural visual is utilized. A free body diagram is a diagram showing all of the forces acting on a single object. Newton's Third Law of Motion Newton's Third Law of Motion defines how forces interact between interacting bodies. According to Newton's Third Law of Motion, forces come in equal and opposite pairs which act on different objects. This law highlights that forces never exist in isolation on a single body; rather, paired equal and opposite forces always act on two distinct, different objects.

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