What is the force that throws the water from a spinning impeller?

• A. Magnetic Force
• B. Gravitational Force
• C. Centrifugal Force
• D. Frictional Force

Answer: (C)

When something spins, it tends to move outward from the center. In a spinning impeller, the blades push water outward, giving it radial acceleration toward the outer edge. This outward tendency is described as centrifugal force in the rotating frame. In the real, inertial view, the blades’ push transfers momentum to the water, causing it to move outward, but the effect is still the outward fling we call centrifugal force. The other forces don’t explain this outward launch: magnetic force would require magnetic fields, gravity acts vertically and doesn’t drive the sideways outward motion, and friction helps transfer momentum but isn’t what launches the water outward. So, the force at work is centrifugal force.