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Unit 3, Quiz #3

Equations:

 

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


Useful Web Links

Equilibrium and Statics (23 seconds)

 

2. A pair of forces of magnitude 5 N and 4 N are added together with a variety of directions. The maximum possible resultant which could be obtained is

  1. 0 N
  2. 1 N
  3. 5 N
  4. 9 N
  5. 20 N


Useful Web Links

Addition of Forces (19 seconds)

 

3. A pair of forces of magnitude 5 N and 4 N are added together with a variety of directions. The minimum possible resultant which could be obtained is

  1. 0 N
  2. 1 N
  3. 5 N
  4. 9 N
  5. 20 N


Useful Web Links

Addition of Forces (19 seconds)

 

4. A boat is rowed at 8 km/hr, east in a river which flows at 6 km/hr, north. The resultant speed of the boat is

  1. 2 km/hr
  2. 6 km/hr
  3. 8 km/hr
  4. 10 km/hr
  5. 14 km/hr


Useful Web Links

The River Boat animation (5 seconds)

Independence of Perpendicular Components of Motion (12 seconds)

 

5. A 50-N force is applied at an angle of 30 degrees north of east. This would be the same as applying two forces at

  1. 43 N, east and 7 N, north
  2. 35 N, east and 15 N, north
  3. 25 N, east and 25 N, north
  4. 43 N, east and 25 N, north


Useful Web Links

Resolution of Forces (22 seconds)

 

6. If an object is at equilibrium then it must

  1. be at rest.
  2. be moving with a constant speed.
  3. not be accelerating
  4. none of these


Useful Web Links

Equilibrium and Statics (23 seconds)

 

7. A northeast and a southeast vector are being added using the parallelogram method. Which diagram below illustrates the correct method of adding two such vectors.


Useful Web Links

Addition of Forces (19 seconds))

 

8. What is the resultant velocity of a 5-ton airplane that normally flies at 200 km/hr if it experiences a 50-km/hr tailwind? Explain your answer.


Useful Web Links

The Plane and The Wind Animation (9 seconds)

Independence of Perpendicular Components of Motion (12 seconds)

 

9. When hanging clothes on a clothesline, is it best to arrange the clotheline so that it is entirely horizontal or so that it has some sag in it? Clearly explain your answer using your understanding of vector components.


Useful Web Links

Resolution of Forces (22 seconds)

Equilibrium and Statics (23 seconds)

 

10. A 1000-N force is applied at 30° east of south to a 200-kg railroad car. Use trigonometric functions to determine the eastward and southward components of this force. Please show your work below.

 

Show your work:

 

The southward component of force on the above railroad car is balanced by the northward normal force of the track pushing against the wheels of the railroad car. There is a frictional force of 400 N directed westward. Determine the acceleration of the 200-kg railroad car. PSYW


Useful Web Links

Resolution of Forces (22 seconds)

Net Force Problems Revisited (17 seconds)

 

 

11. After its most recent delivery, the infamous stork announces the good news. If the sign has a mass of 10 kg, then what is the tensional force in each cable? Use trigonometric functions and a sketch to determine the answer. Clearly show and label all your work.


Useful Web Links

Resolution of Forces (22 seconds)

Equilibrium and Statics (23 seconds)

 

 

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Special thanks to lab assistant Carl Bobis for his assistance in converting quiz to HTML format.  

© Tom Henderson, 1996-1999


Glenbrook South High School.

Last updated on 10/18/99.