Green or Dark Yellow Phlegm. A thick and dark yellow phlegm may be a sign of a viral or bacterial infection, sinus infection, or lower respiratory tract infection. Typically, this occurs when the immune system sends white blood cells, known as neutrophils, to the area of infection.ink Phlegm. Pink-colored phlegm is anything but pretty. Coughing up pink phlegm is an indicator of pulmonary edema, also known as fluid in the lungs. It can also be a sign of bleeding when seen in small amounts, which show up as a stain or streak.
The normal force, which is the force that supports the weight of an object on a surface, acts in the opposite direction of gravity. Most often, we see this with objects at rest on a horizontal surface, like a book on a table or someone standing on a floor.
2. Know the equation for normal force of an object at rest. When calculating an object's normal force when that object is at rest on a flat surface, use the formula: N = m * g. 1  In this equation, N refers to the normal force, m refers to the object's mass, and g refers to the acceleration of gravity.. Use the right equation. To calculate the normal force of an object at an angle, you need to use the formula: N = m * g * cos(x). 1  For this equation, N refers to the normal force, m refers to the object's mass, g refers to the acceleration of gravity, and x refers to the angle of incline.