HOMEWORK FOR LAB 9: WORK AND ENERGY

Please list the members of your group:

Answer the following questions in the spaces provided.

Question 1: The block below is pulled a distance of 2.50 m. How much work is done by the force? show your work and include units.

Question 2: Now the force acts in a direction 30° above the horizontal as shown below. If the block is again moved 2.50 m, how much work is done by the force? show your work and include units.


Copyright © 2018 John Wiley & Sons, Inc.

HOMEWORK FOR LAB 8: WORK AND ENERGY

Two objects of different mass start from rest, are pulled by the same magnitude net force, and are moved through the same distance. The work done on object A is 500 J. After the force has pulled each object, object A moves twice as fast as object B. Answer the following questions and show your work.

Question 3A: How much work is done on object B?

Question 3B: What is the kinetic energy of object A after being pulled?

Question 3C: What is the kinetic energy of object B after being pulled

Question 3D: What is the ratio of the mass of object A to the mass of object B?

HOMEWORK FOR LAB 8: WORK AND ENERGY

An object of mass 0.550 kg is lifted from the floor to a height of 3.50 m at a constant speed.

Question 4A: How much work is done by the lifting force (include units)?

Question 4B: How much work is done by the gravitational force on the object?

Question 4C: What is the net work done on the object?

Question 4D: What is the change in kinetic energy of the object?

Question 4E: Are your results consistent with the work-energy principle? Explain.

HOMEWORK FOR LAB 8: WORK AND ENERGY

If the object in Question 4 is released from rest after it is lifted:

Question 5A: What is its kinetic energy just before it hits the floor? show you work.

Question 5B: What is its velocity? show your work.

A force acts on an object of mass 0.425 kg. The force varies with position as shown in the graph that follows.

Question 6: Find the work done by the force in moving the object from 0.40 m to 1.20 m. Explain your calculation and give units.

HOMEWORK FOR LAB 8: WORK AND ENERGY

Question 7: Assuming that there is no friction and that the object in Question 6 starts from rest at 0.40 m, what is the object’s kinetic energy when it reaches 1.20 m? show your calculation and give units.

Question 8: What is the velocity of the object in Question 6 when it reaches 1.20 m? show your calculation and give units.

ALL DONE!

Please remember to edit the report (insert your name - and if necessary your partners), export the report and submit it on D2L.


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