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The question asks, "Which force is caused only by a pressure difference?"

Let's analyze the choices:

- **A. Friction**: This force arises from the interaction between two surfaces in contact and is not related to pressure differences.
  
- **B. Upthrust**: Also known as buoyant force, upthrust occurs because of the difference in pressure between the top and bottom of an object submerged in a fluid. This is directly caused by a pressure difference.
  
- **C. Viscous force**: This force depends on the viscosity of the fluid and the velocity gradient but is not caused by pressure differences alone.
  
- **D. Weight**: Weight is the force due to gravity acting on a mass and is unrelated to pressure differences.

The correct answer is **B. Upthrust**, as it is the force caused specifically by a pressure difference in a fluid.

Do you want more details or have any further questions?

Here are 5 related questions to expand on this topic:

1. How is the magnitude of upthrust calculated for an object submerged in a fluid?
2. What is the relationship between pressure and depth in a fluid?
3. Can friction be affected by pressure, and if so, how?
4. How does the viscosity of a fluid affect the forces on a moving object in the fluid?
5. What role does pressure play in determining the weight of an object in a fluid?

**Tip**: Upthrust is crucial in understanding buoyancy, which explains why objects float or sink depending on the fluid density and pressure difference.

Which force is caused only by a pressure difference?

Understand how upthrust is a force caused by pressure differences in fluids. This concept is key to understanding buoyancy and how objects float or sink. Suitable for high school students learning about fluid dynamics.

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