Civil Engineering (CE) Exam > Civil Engineering (CE) Questions > The lift force on a body isa)due to buoyant f...
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The lift force on a body is
- a)due to buoyant force
- b)the component of the resultant force in the vertical direction
- c)the component of the resultant force in a direction normal to relative velocity
- d)due to drag on the body
Correct answer is option 'C'. Can you explain this answer?
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The lift force on a body isa)due to buoyant forceb)the component of th...
Lift force on a body
The lift force on a body is the force that acts perpendicular to the direction of the relative velocity of the body with respect to the fluid it is moving through. It is an important concept in fluid dynamics, particularly in the study of aerodynamics. The lift force is responsible for generating the upward force that allows an airplane to fly or a bird to stay in the air.
Explanation:
The lift force can be understood by considering the motion of a body through a fluid, such as air or water. When a body moves through a fluid, it experiences different forces acting on it, including drag force, buoyant force, and lift force.
- Buoyant force: The buoyant force is the upward force exerted on a body when it is immersed in a fluid. It is equal to the weight of the fluid displaced by the body. The buoyant force is responsible for objects floating in water or air. However, the lift force is not directly related to the buoyant force.
- Drag force: The drag force is the resistance force experienced by a body moving through a fluid. It acts in the direction opposite to the motion of the body. While the drag force is influenced by the relative velocity of the body, it is not the main factor determining the lift force.
- Lift force: The lift force is primarily due to the pressure difference on the top and bottom surfaces of a body as it moves through a fluid. This pressure difference creates an upward force that acts perpendicular to the direction of the relative velocity. The lift force is responsible for the upward motion of a wing, which allows an aircraft to generate lift and stay airborne.
Therefore, the correct answer is option 'C' - the lift force is the component of the resultant force in a direction normal to the relative velocity. It is not directly related to the buoyant force, the drag force, or the vertical component of the resultant force.
The lift force on a body is the force that acts perpendicular to the direction of the relative velocity of the body with respect to the fluid it is moving through. It is an important concept in fluid dynamics, particularly in the study of aerodynamics. The lift force is responsible for generating the upward force that allows an airplane to fly or a bird to stay in the air.
Explanation:
The lift force can be understood by considering the motion of a body through a fluid, such as air or water. When a body moves through a fluid, it experiences different forces acting on it, including drag force, buoyant force, and lift force.
- Buoyant force: The buoyant force is the upward force exerted on a body when it is immersed in a fluid. It is equal to the weight of the fluid displaced by the body. The buoyant force is responsible for objects floating in water or air. However, the lift force is not directly related to the buoyant force.
- Drag force: The drag force is the resistance force experienced by a body moving through a fluid. It acts in the direction opposite to the motion of the body. While the drag force is influenced by the relative velocity of the body, it is not the main factor determining the lift force.
- Lift force: The lift force is primarily due to the pressure difference on the top and bottom surfaces of a body as it moves through a fluid. This pressure difference creates an upward force that acts perpendicular to the direction of the relative velocity. The lift force is responsible for the upward motion of a wing, which allows an aircraft to generate lift and stay airborne.
Therefore, the correct answer is option 'C' - the lift force is the component of the resultant force in a direction normal to the relative velocity. It is not directly related to the buoyant force, the drag force, or the vertical component of the resultant force.
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The lift force on a body isa)due to buoyant forceb)the component of th...
When a fluid flows over a stationary body, a force is exerted by the fluid on the body. Similarly, when the body is moving in a stationary fluid, a force is exerted by the fluid on the body.
This total force can be resolved into two components, one in direction of motion and another perpendicular to the direction of motion.
The perpendicular component of this force to the oncoming flow direction (or relative velocity of fluid flow) is called lift and the horizontal component of this force parallel to the flow direction is called drag force.
This total force can be resolved into two components, one in direction of motion and another perpendicular to the direction of motion.
The perpendicular component of this force to the oncoming flow direction (or relative velocity of fluid flow) is called lift and the horizontal component of this force parallel to the flow direction is called drag force.
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The lift force on a body isa)due to buoyant forceb)the component of the resultant force in the vertical directionc)the component of the resultant force in a direction normal to relative velocityd)due to drag on the bodyCorrect answer is option 'C'. Can you explain this answer?
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