A hockey puck slides along a horizontal, smooth icy surface at a constant velocity as shown. (Figure 1) Which of the following forces act on the puck? Select all that apply. O normal force air drag O friction acceleration O force of velocity O weight O force of pushEven though real life can present us with a wide variety of situations, we will be mostly dealing with a very small number of forces. Here are the principal ones of interest:Weight, or the force due to gravity. Weight acts on every object and is directed straight down unless we are considering a problem involving the nonftat earth {e.g., satellites}. Normal force. The normal force exists between two surfaces that are pressed against each other; it is always perpendicularto the surfaces. Force of tension. Tension exists in strings, springs, and other objects of nite length. ft is directed along the string or a spring. Keep in mind that a spring can be either compressed or stretched whereas a string can only be stretched. Force of friction. A friction force exists between two surfaces that either move or have a tendency to move relative to each other. Sometimes, the force of air drag, similar in some ways to the force of friction, may come into play. These forces are directed so that they resist the relative motion of the surfaces. To simplify problems you often assume that friction is negligible on smooth surfaces and can be ignored. In addition, the word friction commonly refers to resistive forces other than air drag that are caused by contact between surfaces, so you can ignore air drag in problems unless you are explicitly told to consider its effects. The following examples should help you learn to draw freebody diagrams. We will start with relatively simple situations in 1.Irhioh the object of interest is either explicitly suggested or fairly:r obvious. Learning Goal: To learn to draw free-body diagrams for various real- life situations.Imagine that you are given a description of a real-life situation and are asked to analyze the motion of the objects involved. Frequently, that analysis involves finding the acceleration of the objects, which, in turn, requires that you find the net force.To find the net force, you must first identify all of the forces acting on the object and then add them as vectors. Such a procedure is not always trivial. It is helpful to replace the sketch of the situation by a drawing of the object (represented as a particle) and all the forces applied to it. Such a drawing is called afree-body diagram. This problem will walk you through several examples of free-body diagrams and will demonstrate some of the possible pitfalls. Here is the general strategy for drawing free-body diagrams:- identify the object of interest. This may not always be easy: A sketch of the situation may contain many objects, each of 1which has a different set of forces acting on it. Including forces acting on different objects in the same diagram will lead to contusion and a wrong solution. Draw the object as a dot. Draw and clearly label all the forces acting on the object of interest. The forces should be shown as vectors onginating from the dot representing the object of interest. There are two possible difficulties here:omitting some forces and drawing the forces that either don't exist at all or are applied to other objects. To avoid these two pitfalls, remember that every force must be applied to the object of interest by some other object. Once all of the forces are drawn, drawthe coordinate system. The origin should coincide with the dot representing the object of interest and the axes should be chosen so that the subsequent calculations of vector components of the forces will be relatively simple. That is, as many forces as possible must be