Giant Cell Arteritis GCA is often a difficult problem for the physician because it is common, serious, has a myriad of presentations, often reoccurs, and the treatment is very difficulty with frequent iatrogenic problems. Several questions will be addressed in this review based on these cases:. Recognition of GCA is difficult in a well established patient who is elderly and typically has many confounding chronic health problems. A well established, 70 year old female patient since has controlled hypertension with no complications. She is a smoker and takes clonidine, hctz, and estrogen.
Case Study: The Crash
Hit-and-run Accidents: a Case Study - Scene Finder
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The Case of the Wobbly Ladder: An Accident Investigation Case Study
A traffic collision , also called a motor vehicle collision , car accident , or car crash , occurs when a vehicle collides with another vehicle, pedestrian , animal , road debris , or other stationary obstruction, such as a tree, pole or building. Traffic collisions often result in injury, disability, death, and property damage as well as financial costs to both society and the individuals involved. Road transport is the most dangerous situation people deal with on a daily basis, but casualty figures from such incidents attract less media attention than other, less frequent types of tragedy. A number of factors contribute to the risk of collisions, including vehicle design , speed of operation, road design , weather , road environment, driving skills, impairment due to alcohol or drugs , and behavior, notably aggressive driving , distracted driving, speeding and street racing.
A free-body diagram for the car is shown at left. Both the normal force, N blue components and the friction force, f red components have been resolved into horizontal and vertical components. Notice that there are now 3 vectors in the vertical direction there were 2 vectors in the no-friction case , and:. Using the approximation , where is the coefficient of friction, gives:. If the coefficient of friction is zero, this reduces to the same normal force as we derived for no-friction , which is reassuring.