AnswersDriveIn fluid dynamics, drag (sometimes called air resistance, a type of friction, or fluid resistance, another type of friction or fluid friction) is a force acting opposite to the relative motion of any object moving with respect to a surrounding fluid.
What are the aerodynamics of a car?
Automotive aerodynamics is the study of the aerodynamics of road vehicles. Its main goals are reducing drag and wind noise, minimizing noise emission, and preventing undesired lift forces and other causes of aerodynamic instability at high speeds. Air is also considered a fluid in this case.
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Why do heavier objects fall faster?
Another way of thinking of this is to say that gravity has to pull harder on a heavy object than a light one in order to speed them both up by the same amount. However, in the real world, we have things like air resistance, which is why sometimes heavy things do fall faster.
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How does drag affect an airplane?
While the plane is flying forward, air moving over and under the wings is providing an upward lift force on the plane. At the same time, air pushing back against the plane is slowing it down, creating a drag force. The weight of the paper plane also affects its flight, as gravity pulls it down toward Earth.
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Why do more massive objects fall faster?
As learned above, the amount of air resistance depends upon the speed of the object. Thus, more massive objects fall faster than less massive objects because they are acted upon by a larger force of gravity; for this reason, they accelerate to higher speeds until the air resistance force equals the gravity force.
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Why is air resistance important?
Falling objects increase their speed as they fall, because their weight (the force of gravity) pulls them to Earth. They also experience an upward force called air resistance (drag), which slows them down.
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How is the acceleration of a falling object affected by gravity?
Air resistance slows the acceleration of falling objects. An object falls at its terminal velocity when the upward force of air resistance equals the downward force of gravity. Acceleration depends on both force and mass. A heavier object experiences greater gravitational force than a lighter object does.
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What is an example of air resistance?
Air resistance force is the force of air pushing against a moving object. Air resistance force is a type of frictional force (refer to Chapter 5 of this unit). When you walk, for example, you are affected by air resistance force, but it does not really slow you down.
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What is induced drag on an airplane?
Induced Drag is an inevitable consequence of lift and is produced by the passage of an aerofoil (e.g. wing or tailplane) through the air. Air flowing over the top of a wing tends to flow inwards because the decreased pressure over the top surface is less than the pressure outside the wing tip.
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What is the acceleration due to gravity on Earth?
It was learned in the previous part of this lesson that a free-falling object is an object that is falling under the sole influence of gravity. A free-falling object has an acceleration of 9.8 m/s/s, downward (on Earth).
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How does it work Parachute?
With parachutes, it's the slowing-down effect that we want. If you fall from a plane without a parachute, your relatively compact body zooms through the air like a stone; open your parachute and you create more air resistance, drifting to the ground more slowly and safely—much more like a feather.
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Why does a projectile travel in a curved path?
Describe why a projectile follows a curved path. The combination of an initial forward velocity and the downward vertical force of gravity causes the ball to follow a curved path. When the forces on an object are balanced, the net force is zero and there is no change in the objects motion.
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How is drag calculated?
The drag equation states that drag D is equal to the drag coefficient Cd times the density r times half of the velocity V squared times the reference area A. For given air conditions, shape, and inclination of the object, we must determine a value for Cd to determine drag.
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How drag is created?
Drag is the aerodynamic force that opposes an aircraft's motion through the air. Drag is generated by every part of the airplane (even the engines!). Drag is generated by the difference in velocity between the solid object and the fluid. There must be motion between the object and the fluid.
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Why do some things move and at times faster than the others?
Galileo discovered that objects that are more dense, or have more mass, fall at a faster rate than less dense objects, due to this air resistance. A feather and brick dropped together. Air resistance causes the feather to fall more slowly.
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What can reduce drag?
Therefore, the easiest method of decreasing drag is to lower the coefficient of drag of the car [3]. Therefore, vehicle designers change specific aspects of the shape of the body of the vehicle in order to reduce the total aerodynamic drag and thus increase fuel economy.
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What is the pressure drag?
Pressure drag is caused by the air particles being more compressed (pushed together) on the front-facing surfaces and more spaced out on the back surfaces. This is caused when the layers of air separate away from the surface and begin to swirl – this is called turbulent flow.
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What is the definition of aerodynamic drag?
Drag is the force of wind or air resistance pushing in the opposite direction to the motion of the object, in this case, the cyclist and the bike. The two types of aerodynamic drag that act against a cyclist are: pressure drag. skin friction drag.
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What does drag affect?
Factors that Affect Drag. Geometry has a large effect on the amount of drag generated by an object. As with lift, the drag depends linearly on the size of the object moving through the air. The cross-sectional shape of an object determines the form drag created by the pressure variation around the object.
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What is drag drug?
Just Say No to “Drug” The quick and dirty tip is to just say no to “drug.” Its only standard meaning has to do with illegal drugs or pharmaceuticals. “Dragged” is the proper past tense form of the word “drag” when you're using it to talk about having pulled something across the floor.