may lift your back foot partly off the floor and swivel on it‚ but the service laws require you to keep some part of both feet in contact with the floor until you hit the shuttlecock. You must not lift a foot entirely off the ground‚ and you must not drag a foot along the floor. Basic serving technique Backhand low serve Backhand flick serve Backhand drive serve Forehand low serve Forehand flick and drive serves Forehand high serve Hitting action Serving tactics As you turn
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1908. Unlike other designs‚ the dimple proved to be the most aerodynamically efficient. Dimpled balls fly farther than non-dimpled balls due to the combination of two effects. There is drag‚ which is the force acting opposite to the object to slow it down‚ lift which is the force acting at a right angle to drag and generally upwards‚ and gravity. How is lift created? Newton’s third law states that for every action there is an equal and opposite reaction. The ball when spins exerts a force
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it is viewed as natural. The culture of drag serves as a testament to this. Drag culture points out that gender is in fact a form of impersonation‚ as the purpose of the culture is to imitate women (Butler‚ 1993). Butler states that this imitation of women corroborates the notion gaining cultural acceptance only requires some cosmetic changes as well as mannerism‚ which are not inherent qualities that women have from birth (Butler‚ 1993). Ultimately‚ drag goes against the norms people accept as the
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in me falling off of a lot of waves. There are two biomechanical principles that help explain propulsive forces produced by a surfer when paddling through the water‚ these include: * Drag force * Lift force Drag force: Definition: Drag force is due to pressure difference (Amezdroz‚ et al‚. 2010). Drag force is used to propel a surfer in water. “As the hand is pulled back in the water‚ the water then flows or travels past the hand and becomes turbulent at the back of the hand. This fast
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ABSTRACT One of the most widely used methodologies in characterising the quality of a wind tunnel is to study the flow over a sphere.The flow around the bluff body was characterised using smoke test‚ and the region of flow separation was analysed. The drag characteristics of 3 spheres of different diameters were studied for a wide range of Reynolds number. The Reynolds number at which the transition occurs is strongly dependent on the degree of turbulence in the wind tunnel. Based on the following tests
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having dimples on the golf ball reduce drag? Firstly we have to look at the aerodynamics around golf balls‚ since the only force that can slow down a golf ball while in mid-air is the air flowing around the surface of it. We call these resistive forces drag forces‚ and there are two kinds which inevitably slow down spherical golf balls; pressure drag and skin friction drag. Skin friction drag is the shear forces on the sphere from the air molecules. Pressure drag is a resistive force caused by turbulent
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Acceleration Due to Gravity Conducted on October 6th‚ 2014 Objective: The object of the experiment is to determine whether or not objects fall freely at the same rate and speed. Measure and calculate the time in which it takes random objects to hit the ground from a certain height and determine if the objects have the same rate of motion or not. Materials: 1. Meter Stick 2. Stopwatch 3. Wallet 4. Quarter 5. Tape 6. Hot sauce packet from Chinese food delivery 7. Container of wipes
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Today we know that aerodynamics plays a major role in many sports‚ such as tennis‚ soccer‚ hunting‚ and motor sports‚ we will investigate the effects of aerodynamics on baseball. The three main forces that act on a baseball in flight are the weight‚ drag‚ and lift. In an effort to understand how a baseball changes direction we will discuss an additional force called the lift coefficient or Magnus Force. This force is developed by the rotation or spinning of the baseball. We will discuss several
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falling in a vacuum‚ this would be the only force acting on the object. But in the atmosphere‚ the motion of a falling object is opposed by the air resistance or drag. The drag equation tells us that drag is equal to a coefficient times one half the air density (R) times the velocity (V) squared times a reference area on which the drag coefficient is based. The motion of a falling object can be described by Newton ’s second law of motion‚ Force = mass x acceleration. Do a little algebra and
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The Airfoil & Theories of Lift Airfoil Definition: Have you noticed the curved shape of a bird ’s wing? An airplane ’s wing is curved also. A wing is designed for flight. It has a special shape called an airfoil. The airfoil shape provides a lifting force when air flows around it. Airfoil shapes can be found on wings‚ fans and propellers. Importance: An airplane’s airfoil plays a very important role in lifting the aircraft. The airfoil is designed to increase the velocity of the
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