1. A block initially at rest is given a quick push by a hand. The block slides across the floor, gradually slows down, and comes to rest. In the spaces provided, draw and label separate free-body diagrams for the block at each of the three instants shown. 3o nonal 1. 2. 3. (Initially at rest) A quick push by a hand... the sliding block slows... and is finally at rest. ladal bun wab,wod 201 t mib e b. Rank the magnitudes of all the horizontal forces in the diagram for instant 1. Explain. siniq Jeallerae or dl eoti shuiogam of paibuoo bi boe haoose a'norw Ins wod Are any of the forces that you drew for instant 1 missing from your diagram for instant 2? If so, for each force that is missing, explain how you knew to include the force on the first diagram but not on the second. с.

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# Newton's Second and Third Laws

### Problem 1:
A block initially at rest is given a quick push by a hand. The block slides across the floor, gradually slows down, and comes to rest.

a. In the spaces provided, draw and label separate free-body diagrams for the block at each of the three instants shown.

- **Diagram 1: (Initially at rest)**
    - Description: A quick push is given by a hand to a block.
    - Graphical notations: The block is shown with an arrow pointing to the right, indicating the direction and force of the quick push.

- **Diagram 2: (While sliding)**
    - Description: The sliding block slows down.
    - Graphical notations: The block continues to move to the right with the velocity vector \( v \).

- **Diagram 3: (At rest)**
    - Description: The block finally comes to rest.
    - Graphical notations: The block is stationary with no arrows indicating velocity or external forces left.

b. Rank the magnitudes of all the horizontal forces in the diagram for instant 1. Explain.

c. Are any of the forces that you drew for instant 1 missing from your diagram for instant 2? If so, for each force that is missing, explain how you knew to include the force on the first diagram but not on the second.

d. Are any of the forces that you drew for instant 1 missing from your diagram for instant 3? If so, for each force that is missing, explain how you knew to include the force on the first diagram but not on the third.

---

**Note:**
This is a problem from the "Tutorials in Introductory Physics" series by McDermott, Shaffer, and the P.E.G., U. Wash., as part of Pearson's educational resources. Custom 2nd Ed., for U.CO, Boulder.
Transcribed Image Text:# Newton's Second and Third Laws ### Problem 1: A block initially at rest is given a quick push by a hand. The block slides across the floor, gradually slows down, and comes to rest. a. In the spaces provided, draw and label separate free-body diagrams for the block at each of the three instants shown. - **Diagram 1: (Initially at rest)** - Description: A quick push is given by a hand to a block. - Graphical notations: The block is shown with an arrow pointing to the right, indicating the direction and force of the quick push. - **Diagram 2: (While sliding)** - Description: The sliding block slows down. - Graphical notations: The block continues to move to the right with the velocity vector \( v \). - **Diagram 3: (At rest)** - Description: The block finally comes to rest. - Graphical notations: The block is stationary with no arrows indicating velocity or external forces left. b. Rank the magnitudes of all the horizontal forces in the diagram for instant 1. Explain. c. Are any of the forces that you drew for instant 1 missing from your diagram for instant 2? If so, for each force that is missing, explain how you knew to include the force on the first diagram but not on the second. d. Are any of the forces that you drew for instant 1 missing from your diagram for instant 3? If so, for each force that is missing, explain how you knew to include the force on the first diagram but not on the third. --- **Note:** This is a problem from the "Tutorials in Introductory Physics" series by McDermott, Shaffer, and the P.E.G., U. Wash., as part of Pearson's educational resources. Custom 2nd Ed., for U.CO, Boulder.
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