PHYS 115 Chapter Notes - Chapter 4: Friction, Fundamental Interaction, Net Force
Document Summary
Force is imagined as a push or pull on some object. Force is a vector quantity (like velocity and acceleration) Contact forces result from physical contact between two objects. The force of gravitational attraction between two objects is an example of a field force. Another example of field forces: the electric force that one electric charge exerts on another. Newton"s first law: an object moves with a velocity that is constant in magnitude and direction unless a non-zero net force acts on it. It"s not in the nature of an object to stop, once set in motion, but rather to continue in its original state of motion. The net force of an object is defined as the vector sum of all external forces exerted on the object. The net force acting on an object that is either at rest and remaining at rest, or moving with constant velocity is zero (according to newton"s first law)
