Question

Show all work done for calculations, starting with an equation whenever possible, and include all units. If asked to explain, give a brief response (1-2 complete sentences).

For full credit on FBDs and N2L expressions, follow the guidelines in the topic summary on FBDs.

Invent unique, concrete situations for each of the four cases below.

• Describe each situation clearly and concretely in 1-2 sentences.

• Make a complete free-body diagram showing the forces acting on the object you've chosen.

• Write out a complete N2L expression for each axis

◦ none of the final N2L expressions should contain “Fnet x” or “Fnet y”, and should include an “ma” term only if the object is accelerating parallel to a given axis.

For your invented situations, the key words are unique and concrete: don't copy from examples or assigned problems; name a specific object (car, refrigerator, basketball, …) for each case and use that name to describe what's happening to it (or what it's doing), rather than abstract words like "object" or "body". Also name forces specifically (e.g., “static friction” and “FS” rather than “friction” and “FF”).

a) Three forces act on an object, each one of a different type.

b) Four forces act on an object, each one of a different type.

c) Four forces act on an object; two are of the same type, but exerted by different objects.

d) Five forces act on an object; no more than two can be of the same type.

Answer 1