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Unit 3 Quiz #4

1. Three pictures of equal weight (20 N) are hung by wires in three different orientations. In which orientation is the tension in the wires the least? Circle the correct answer.


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Equilibrium and Statics (23 seconds)

 

2. Forces of 5 N and 12 N act at right angles on a point. The magnitude of their resultant in N is

  1. 7
  2. 11
  3. 13
  4. 17
  5. 60


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Addition of Forces (19 seconds)

 

3. The resultant of a number of concurrent forces which are in equilibrium

  1. depends on the angles between them
  2. depends on the number of forces
  3. depends on magnitudes and angles
  4. depends on all three (a,b, & c)
  5. is zero


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Equilibrium and Statics (23 seconds)

 

4. A horizontal force of 100 N is needed to pull a sled forward. If the rope pulling the sled makes an angle of 30-degrees with the horizontal, the tension in the rope (in N) must be approximately

  1. 50
  2. 87
  3. 115
  4. 200


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Resolution of Forces (22 seconds)

Net Force Problems Revisited (17 seconds)

 

5. A 1.40-kg "Eat at Ed's" sign is hung symmetrically between two strings. The angle between the strings is 100°. Draw a clear and meaningful triangle and use trigonometric functions to predict the tension in a single string. PSYW

 

 


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Resolution of Forces (22 seconds)

Equilibrium and Statics (23 seconds)

 

6. A 50-kg crate is placed on a 45° inclined plane. The coefficient of friction between the crate and the plane is 0.20. Fill in the blanks in the diagram and determine the acceleration of the crate down the plane. Clearly show your work for the acceleration calculation.


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Inclined Planes (25 seconds)

 

7. A 10-kg object is pulled across a rough surface. The velocity-time graph for its motion is shown at the right. Utilize Newton's second law and an understanding of vector resolution in order to fill in the blanks in the diagram below.


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The Meaning of Slope for a v-t Graph (9 seconds)

Net Force Problems Revisited (17 seconds)

 

8. Jack and Jill climbed up a hill which had a 30° incline. They boarded a sled, with physics in head, and tried to find their accelerashine. Assuming that the surface is frictionless and that the combined mass of Jack, Jill, and the sled is 180 kg, determine their acceleration. Utilize a free-body diagram if necessary. PSAYW

 

 

Demonstrate your understanding of acceleration by filling in the velocity-time table for the motion of Jack and Jill down the hill.


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Inclined Planes (25 seconds)

Acceleration (12 seconds)

 

 

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© Tom Henderson, 1996-1999


Glenbrook South High School.

Last updated on 10/18/99.