Force is a physical quantity that describes the interaction between two objects. It can be defined as a push or pull that causes an object to accelerate or change its motion.
Force is typically measured in units of Newtons (N) or pounds (lbs). The most common way to measure force is by using a spring scale or a force meter.
Force can be expressed in different ways depending on the context. It can be expressed as a vector quantity, with both magnitude and direction, or as a scalar quantity, with only magnitude. It can also be expressed through equations, such as Newton's second law of motion (F=ma) or through diagrams, such as free body diagrams.
Some common examples of force include gravity, friction, tension, and normal force. For example, gravity is the force that pulls objects towards the center of the Earth, while friction is the force that opposes motion between two surfaces.
Force is what causes an object to accelerate or change its motion. According to Newton's second law of motion, the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. This means that the greater the force acting on an object, the greater its acceleration will be.