A numerical expression is a mathematical statement involving only numbers and one or more operation symbols. Thus if someone gives you an expression, for example, x + 2 – 3 + 8 = 11, and says that it is a numerical expression, you have to deny that
Types of forces: Contact Forces and Non Contact Forces. Force is the external agent that produces motion. Basically, there are two main types of forces, contact forces, and non-contact forces. Gravitational forces, electric forces, magnetic forces, nuclear forces, frictional forces are some examples of force.