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

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

Invent unique, concrete situations for each of the four casesbelow.

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

• Make a complete free-body diagram showing the forces acting onthe 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 isaccelerating parallel to a given axis.

For your invented situations, the key words are unique andconcrete: don't copy from examples or assigned problems; name aspecific 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 differenttype.

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

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

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