A 7-cm-diameter hockey ball is launched at a speed
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A 7-cm-diameter hockey ball is launched at a speed

A 7-cm-diameter hockey ball is launched at a speed of 50 m/s and a spin rate of 1000 RPM. Estimate the lift and drag forces, based on Fig. 8.30, and use the air properties from Table 1.1.

A soccer player kicks a 22-cm-diameter ball at a speed of 30 m/s and a spin rate of 1000 RPM with the intention of creating a curved trajectory. If the ball weight is 0.45 kg, estimate the percentage of the resulting side force-to-weight ratio. (Estimate the lift force based on Fig. 8.30 and use the air properties from Table 1.1.)

Hint
EngineeringFriction Drag can also be referred to as the skin friction drag, this is drag caused by friction of the fluid against a surface of the object that is moving via it. Which is directly proportional to an area of the surface in touch with a fluid and it increases with square of the velocity. Frictional drag equals to drag coefficient Cd multiplied by the density r times half of velocity V ...

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