The two blocks in the figure below are attached to each other by a massless string that is wrapped around a frictionless pulley. YA 2.0 kg G When the bottom 4.00-kg block is pulled to the left by the constant force P, the top 2.00-kg block slides across it to the right. If the blocks move at a constant speed, then answer the following questions. (a) In which direction does the force of kinetic friction act on the 2.0 kg block from the 4.0 kg block? P 4.0 kg

The two blocks in the figure below are attached to each other by a massless string that is wrapped around a frictionless pulley. YA 2.0 kg G When the bottom 4.00-kg block is pulled to the left by the constant force P, the top 2.00-kg block slides across it to the right. If the blocks move at a constant speed, then answer the following questions. (a) In which direction does the force of kinetic friction act on the 2.0 kg block from the 4.0 kg block? P 4.0 kg

Name: The two blocks in the figure below are attached to each other by a ma
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Description: The two blocks in the figure below are attached to each other by a massless string that is wrapped around a frictionless pulley.**Diagram Description:**- The diagram shows a 2.0 kg block resting on top of a 4.0 kg block. - A massless string connects

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

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Newton's Second Law

Newton’s laws of motion describe the relationship between the motion of an object and forces acting on it. Newton’s law of motion has two types as follows:

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The two blocks in the figure below are attached to each other by a massless string that is wrapped around a frictionless pulley.

**Diagram Description:**
- The diagram shows a 2.0 kg block resting on top of a 4.0 kg block.
- A massless string connects them and runs over a frictionless pulley.
- The force \( \vec{P} \) pulls the 4.0 kg block to the left, while the 2.0 kg block slides to the right across the 4.0 kg block.
- Coordinate axes are shown with positive \( y \) direction upwards and positive \( x \) direction to the right.

**Question:**
When the bottom 4.00 kg block is pulled to the left by the constant force \( \vec{P} \), the top 2.00 kg block slides across it to the right. If the blocks move at a constant speed, then answer the following question:

(a) In which direction does the force of kinetic friction act on the 2.0 kg block from the 4.0 kg block?

**Options:**
- A. To the left
- B. To the right
- C. There is no friction between the 2.0 kg block and the 4.0 kg block ✔️

The correct answer is marked as option C: There is no friction between the 2.0 kg block and the 4.0 kg block.

**Question:**

(b) Two surfaces are in contact with the 4.0 kg block, the 2.0 kg block, and the floor. In what directions do the two friction forces act on the 4.0 kg block?

- **A.** Both act to the left
- **B.** Both act to the right
- **C.** The force between the two blocks acts to the left and the force between the 4.0 kg block and the floor acts to the right
- **D.** The force between the two blocks acts to the right and the force between the 4.0 kg block and the floor acts to the left

*Correct Answer:* A. Both act to the left

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Step 1: Determine the direction of the kinetic friction force acting on the block of mass 2 kg:

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Step 2: Determine the direction of the two friction forces acting on the block of mass 4 kg:

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