1. Martha is pushing a 35 kg chair across the floor. The coefficients of fre chair and floor are µs 0.70 and µk = 0.40. %3D a) How hard does she need to push horizontally to just start the chair moving? b) If she applies this same force once it is moving, what is the resulting acceleration? Draw the free-body diagram for this situation.

College Physics
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ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
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**Problem:**

1. Martha is pushing a 35 kg chair across the floor. The coefficients of friction between the chair and floor are μ<sub>s</sub> = 0.70 and μ<sub>k</sub> = 0.40.

   a) How hard does she need to push horizontally to just start the chair moving?  
   b) If she applies this same force once it is moving, what is the resulting acceleration?  
   Draw the free-body diagram for this situation.

**Diagram Explanation:**

The image includes a simple free-body diagram that shows a person pushing a chair. The diagram illustrates the following forces acting on the chair:

- **Applied Force:** The force exerted by Martha in the direction of motion.
- **Frictional Force:** The force opposing the motion due to contact with the floor.
- **Normal Force:** The perpendicular force exerted by the floor on the chair.
- **Gravitational Force:** The downward force due to the chair's weight.

The diagram helps visualize the problem by showing how each force interacts with the chair as Martha pushes it.
Transcribed Image Text:**Problem:** 1. Martha is pushing a 35 kg chair across the floor. The coefficients of friction between the chair and floor are μ<sub>s</sub> = 0.70 and μ<sub>k</sub> = 0.40. a) How hard does she need to push horizontally to just start the chair moving? b) If she applies this same force once it is moving, what is the resulting acceleration? Draw the free-body diagram for this situation. **Diagram Explanation:** The image includes a simple free-body diagram that shows a person pushing a chair. The diagram illustrates the following forces acting on the chair: - **Applied Force:** The force exerted by Martha in the direction of motion. - **Frictional Force:** The force opposing the motion due to contact with the floor. - **Normal Force:** The perpendicular force exerted by the floor on the chair. - **Gravitational Force:** The downward force due to the chair's weight. The diagram helps visualize the problem by showing how each force interacts with the chair as Martha pushes it.
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