## Assessment 3 ### 1. James very, very slowly moves a box from the table down to the floor. Draw a picture showing the direction of the force that he exerts on the box and the direction of the box’s displacement. Complete the table below. (There are no changes to internal energy or kinetic energy.) | | Work done so far | Gravitational Potential Energy of the box-Earth system | |--------------------------------------|------------------|------------------------------------------------------| | James has not started yet. | | 100 J | | James has moved the box ¼ of the way to the ground. | | | | James has moved the box ½ of the way to the ground. | | | | James has moved the box ¾ of the way to the ground. | | | | The box is on the ground. | | -100 J | *Why was the work done on the system negative?* ### 2. Think of a real-life situation that is consistent with the work-energy processes described below. Do not mention previous examples. #### a) No external work is done on the system, but due to some processes in the system, kinetic energy of the system transforms into gravitational potential energy. #### b) Positive work is done on the system, both kinetic energy and gravitational potential energy of the system increase.
## Assessment 3 ### 1. James very, very slowly moves a box from the table down to the floor. Draw a picture showing the direction of the force that he exerts on the box and the direction of the box’s displacement. Complete the table below. (There are no changes to internal energy or kinetic energy.) | | Work done so far | Gravitational Potential Energy of the box-Earth system | |--------------------------------------|------------------|------------------------------------------------------| | James has not started yet. | | 100 J | | James has moved the box ¼ of the way to the ground. | | | | James has moved the box ½ of the way to the ground. | | | | James has moved the box ¾ of the way to the ground. | | | | The box is on the ground. | | -100 J | *Why was the work done on the system negative?* ### 2. Think of a real-life situation that is consistent with the work-energy processes described below. Do not mention previous examples. #### a) No external work is done on the system, but due to some processes in the system, kinetic energy of the system transforms into gravitational potential energy. #### b) Positive work is done on the system, both kinetic energy and gravitational potential energy of the system increase.
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Transcribed Image Text:## Assessment 3
### 1. James very, very slowly moves a box from the table down to the floor. Draw a picture showing the direction of the force that he exerts on the box and the direction of the box’s displacement. Complete the table below. (There are no changes to internal energy or kinetic energy.)
| | Work done so far | Gravitational Potential Energy of the box-Earth system |
|--------------------------------------|------------------|------------------------------------------------------|
| James has not started yet. | | 100 J |
| James has moved the box ¼ of the way to the ground. | | |
| James has moved the box ½ of the way to the ground. | | |
| James has moved the box ¾ of the way to the ground. | | |
| The box is on the ground. | | -100 J |
*Why was the work done on the system negative?*
### 2. Think of a real-life situation that is consistent with the work-energy processes described below. Do not mention previous examples.
#### a) No external work is done on the system, but due to some processes in the system, kinetic energy of the system transforms into gravitational potential energy.
#### b) Positive work is done on the system, both kinetic energy and gravitational potential energy of the system increase.
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