\(A_x\) | = | Impulse Reaction, the translational force acting at the axis of rotation due to impact, in Newtons. Note that when \(d\) = \(q\) (\(q\) is the distance from the axis of rotation to the center of percussion), the expression within the second set of parentheses becomes zero. |
\(a\) | = | linear acceleration of the mass center, in m/s² |
\(b\) | = | mass of the ball, in kg |
\(c\) | = | coefficient of restitution of the racquet/ball system |
\(d\) | = | distance from the axis of rotation to the impact point, in cm |
\(e\) | = | the distance from the axis of rotation to the tip |
\(F\) | = | force applied at mass center, in Newtons |
\(I\) | = | moment of inertia (swing weight) of racquet, in kgf/cm² |
\(I_5\) | = | moment of inertia (swing weight) of racquet at 5cm from the butt, in kgf/cm² |
\(I_7\) | = | moment of inertia (swing weight) of racquet at 7cm from the butt, in kgf/cm² |
\(I_{10}\) | = | moment of inertia (swing weight) of racquet at 10cm from the butt, in kgf/cm² |
\(I_a\) | = | moment of inertia (swing weight) of racquet at distance \(a\) from the butt, in kgf/cm² |
\(M\) | = | mass of the racquet, in kg |
\(m\) | = | mass in kg |
\(ω\) | = | angular velocity of racquet, in radians/s |
\(p\) | = | linear velocity of impact point, in m/s |
\(r\) | = | distance in cm from mass center (balance point) to axis used in the stroke |
\(s\) | = | ball velocity, in m/s (positive is away from player) |
\(s_1\) | = | velocity of ball before impact, in m/s |
\(s_2\) | = | velocity of ball after impact, in m/s |
\(T\) | = | torque at axis of rotation, in Nms |
\(t\) | = | dwell time, or duration of impact, in seconds |
\(v\) | = | linear velocity of the mass center, in m/s |
\(v_1\) | = | linear velocity, just before impact, of racquet mass center, in meters/second |
\(v_2\) | = | linear velocity, just after impact, of racquet mass center, in meters/second |