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Unit 5 Quiz#1

Equations:

 

1. Ben Travlun carries a 200-N suitcase up two flights of stairs (a height of 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. In the "Its All Uphill" Lab, Amanda B. Reckenwyth applied a 15-N force to a 3-kg cart in order to pull it a distance of 2.0 m along the incline to a final height of 1.0 m. The velocity of the cart was a constant value of 0.50 m/s. Use this information to determine the work which Amanda does upon the cart. See diagram if necessary. PSYW

 

EC: Determine the time required to pull the cart to the final height and use the time to determine the power. PSYW

 


Useful Web Links

Definition and Mathematics of Work (10 seconds)

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

Power (13 seconds)

 

3. Calculate the work done by a 2.0-N force to move a 500 gram box a horizontal distance of 200 cm across a rough floor at a constant speed of 0.5 m/s. The direction of the force is indicated in the diagram. PSYW


Useful Web Links

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 floor. PSYW


Useful Web Links

Types of Forces (8 seconds)

Drawing Free-Body Diagrams (8 seconds)

Finding Acceleration (6 seconds)

 

4. Missy Diwater, the former platform diver of the Ringling Brothers' Circus, dives from a platform into a shallow bucket of water (see diagram at right).

a. Construct a free-body diagram, showing the force(s) acting upon Missy as she is falling from the platform. Label the force(s) to indicate their type. Assume no air resistance.

 

 

b.Identify the force(s) above as being either external or internal forces.

 

c. Does/do the above force(s) change Missy's total mechanical energy? Explain.

 

d. Fill in the blanks in the diagram at the right.

 

e. State Missy's acceleration as she is falling from the platform.

 

f. Determine the speed of Missy just prior to hitting (or missing) the bucket.

 

 


Useful Web Links

Drawing Free-Body Diagrams (8 seconds)

Internal vs. External Forces (11 seconds)

Mechanical Energy (15 seconds)

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

Application and Practice Questions (10 seconds)

The Acceleration of Gravity (6 seconds)

Kinetic Energy (4 seconds)

 

5. A 2-kg object is pulled upward at constant speed by a 20-N force for a vertical displacement of 5 m. The free-body diagram is shown at the right. Indicate which force(s) are doing work upon the object. Then individually calculate the work done by each of these forces. PSYW

 

 


Useful Web Links

Definition and Mathematics of Work (10 seconds)

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

 

 

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© Tom Henderson, 1996-1998


Glenbrook South High School.

Last updated on 12/14/98.