PhysicsLAB CP Workbook
Freebody Diagrams

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In each case, a rock is acted on by one or more forces. On a sheet of paper, draw an accurate vector diagram showing all forces acting on the rock, and no other forces. Use a ruler, and do it in pencil so you can correct mistakes.
Refer to the following information for the next two questions.

The first two diagrams are done as examples.
In the second diagram notice that the parallelogram rule shows the vector sum of A + B is equal and opposite to W (that is, A + B = -W). Also note that the vector along string A is longer than the vector along string B. This signifies that the tension in string A is greater than the tension in string B.
Using a common length for each weight vector complete a parallelogram for diagrams 3 and 4. Then state which tension vector (in the left string or in the right string) is stronger; or if they are equal.
Refer to the following information for the next eight questions.

In each situation, draw and label vectors for the appropriate forces. Then select which forces were present in each diagram:
  • W for weight
  • N for normal
  • f for friction
  • AR for air resistance

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