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Unit 5 Quiz#2

Equations:

 

Use the diagram at the right to answer questions #1 and #2.

1. As the pendulum bob swings from position A to position B, its total mechanical energy (neglecting friction)

  1. decreases.
  2. increases.
  3. remains the same.

2. As the pendulum bob swings from position A to position B, its

  1. speed increases
  2. potential energy decreases
  3. kinetic energy decreases
  4. mass decreases
  5. kinetic energy remains constant


Useful Web Links

Potential Energy (12 seconds)

Kinetic Energy (4 seconds)

Mechanical Energy (15 seconds)

 

3. As a rock falls from a cliff, its total mechanical energy is equal to

  1. its potential energy minus its kinetic energy.
  2. its kinetic energy minus its potential energy.
  3. the product of its kinetic and potential energies.
  4. the sum of its potential and kinetic energies.


Useful Web Links

Mechanical Energy (15 seconds)

 

4. Jennifer exerts a 200 N force to lift a barbell to a vertical height of 2.0 m in 5.0 s. If she had done this in 10 s, the work done would have been

  1. four times as great.
  2. twice as great.
  3. the same.
  4. half as great.
  5. one quarter as great.


Useful Web Links

Definition and Mathematics of Work (10 seconds)

 

5. The kilowatt x hour is a unit of

  1. power
  2. force
  3. velocity
  4. work and energy


Useful Web Links

Power (13 seconds)

 

 

6. 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

 

Determine the rate at which work is done (i.e., power) upon the cart. PSYW

 


Useful Web Links

Definition and Mathematics of Work (10 seconds)

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

Power (13 seconds)

 

7. For each set of units below, identify whether they are units of force, work (or energy), or power. Record your answers in the blanks below.


Useful Web Links

Units of Force (9 seconds)

Definition and Mathematics of Work (10 seconds)

Power (13 seconds)

 

Li Ping Phar, the esteemed Chinese ski jumper, starts at rest on top of a 100-meter hill, skis down the 45° incline and makes a world-record setting jump. The heights at various locations along her path are shown below. Use the diagram to answer questions #8-#12.

 

8. Li Ping Phar has a mass of 50 kg. Fill in the blanks to indicate Li Ping Phar's potential and kinetic energy at position A, C, D, and E (the instant before striking the ground). Neglect friction, air resistance, and the effect of ski poles.


Useful Web Links

Internal vs. External Forces (11 seconds)

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

Work and Energy Practice Problems (10 seconds)

 

9. Determine Li Ping Phar's speed at position D. PSYW


Useful Web Links

Kinetic Energy (4 seconds)

 

10. Determine Li Ping Phar's speed at position E (just prior to hitting the ground). PSYW


Useful Web Links

Kinetic Energy (4 seconds)

 

11. Using a complete sentence, compare the speed of Li Ping Phar at positions B and D, supporting your answer with sound physical reasoning.


Useful Web Links

Kinetic Energy (4 seconds)

Bar Chart Illustrations (21 seconds)

 

12 The Swiss ski jumper, Eaton Alottafude, has a mass of 80 kg. Would Eaton's greater mass create an advantage, disadvantage, or make no difference to his success? Explain clearly.


Useful Web Links

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

 

For 5 points, pick one of the following two problems and solve. To earn 3 extra credit points, obtain perfect solutions to both of them. Please show your work to receive credit.

 

13. A Hot Wheels car traveling with a speed of 4.0 m/s is coasting towards an incline (see diagram). Detemine the height to which the car will rise on the opposite incline. Assume no friction. PSYW


Useful Web Links

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

 

14. A 0.50-N force is applied at an angle of 60° to the horizontal in order to accelerate a 10-kg sled from rest across an icy pond (frictionless) for a distance of 20 meters. Determine the final velocity of the box. PSYW


Useful Web Links

Analysis of Situations Involving External Forces (21 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.