- #1
physicsdude123
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Homework Statement
A bird sits in a birdfeeder suspended from a tree by a wire, as shown in the diagram below.
Let WB and WF be the weight of the bird and the feeder respectively. Let T be the tension in the wire and N be the normal force between the bird and the feeder. Which of the following free-body diagrams best represents the birdfeeder? (The force vectors are not drawn to scale and are only meant to show the direction, not the magnitude, of each force.)
The image and possible solutions are shown here: http://i48.tinypic.com/5zirzp.png
Homework Equations
None, its a conceptual question.
The Attempt at a Solution
I understand that there must be a force of tension and the weight of the feeder that acts on the birdfeeder. The correct answer is (e) in the picture provided... whereas I thought it was (f). I was just wondering if anyone can clarify the distinction between the N force and W{B} force and why it is the N force that must be considered rather than weight of the bird.
Thank you.