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Unit 5 Quiz#1

Equations:

 

1. Ben Travlun carries a 200-N suitcase up two flights of stairs (6.0 m) and then pushes it with a horizontal force of 50.0 N at a constant speed for a distance of 50.0 meters. How much work does Ben do on his suitcase during this motion? PSYW


Useful Web Links

Definition and Mathematics of Work (10 seconds)

Calculating the Amount of Work Done by Forces (10 seconds)

 

2. For each set of units below, identify whether they are units of force, energy, or momentum.


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Definition and Mathematics of Work (10 seconds)

 

3. Calculate the work done to move a 500 gram box a distance of 200 cm across the tabletop at a constant speed of 0.5 m/s. The magnitude and direction of the force is indicated in the diagram. PSYW

 

 

 

 


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Calculating the Amount of Work Done by Forces (10 seconds)

Draw a free body diagram which clearly shows all the forces acting upon the box. Carefully analyze your diagram and determine the acceleration of the box and the coefficient of sliding friction between the box and the tabletop. PSYW


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Types of Forces (8 seconds)

Drawing Free-Body Diagrams (8 seconds)

Finding Acceleration (6 seconds)

 

4. Three identical objects (A, B, and C) of equal mass are located at three different positions. The relative position and velocity of the three objects are shown.

Which one of the three objects has the greatest total mechanical energy? Intelligently support your answer.


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Potential Energy (12 seconds)

Kinetic Energy (4 seconds)

Mechanical Energy (15 seconds)

 

5. A car traveling with a speed of 3.0 m/s is coasting towards an incline (see diagram). Detemine how high the car coasts up the hill on the right. Assume no friction. PSYW


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Analysis of Situations in Which Mech. Energy is Conserved (13 seconds)

Application and Practice Questions (10 seconds)

 

6. Luke Autbeloe drops a 5.00 kg object from a barn. A haystack is positioned 10.0 m below the rooftop of the barn.

  1. Determine the kinetic energy of object the instant before it hits the haystack. PSYW


    Useful Web Links

    Analysis of Situations in Which Mech. Energy is Conserved (13 seconds)

    Application and Practice Questions (10 seconds)

     

  2. Determine the speed of the object the instant before it hits the haystack. PSYW


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    Kinetic Energy (4 seconds)

     

  3. Upon striking the haystack, the object encounters an average restraining force of 150 N. How far into the haystack will the object penetrate before stopping? PSYW


    Useful Web Links

    Analysis of Situations Involving External Forces (21 seconds)

    Application and Practice Questions (10 seconds)

     

  4. Use Newton's second law and a free-body diagram to determine the magnitude and direction of the acceleration of the object while penetrating through the haystack. PSYW


    Useful Web Links

    Drawing Free-Body Diagrams (8 seconds)

    Finding Acceleration (6 seconds)

     

  5. Use your answers in the questions above to construct a velocity-time graph for the motion of the object from the time it enters the haystack to the time it stops. Be sure to label your axis. Indicate the slope of the line on the graph.

 

 

 


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Relating the Shape to the Motion (12 seconds)

Determining the Slope on a v-t Graph (8 seconds)

 

 

 

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

 

© Tom Henderson, 1996-1998


Glenbrook South High School.

Last updated on 9/28/98.