30 lines
1.0 KiB
Dart
30 lines
1.0 KiB
Dart
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/// free fall acceleration in m/s²
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const double _g = 9.81;
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///
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/// Potential Energy = [mass] * [height] * g
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/// with [mass] in kg, [height] in m and result in m²kg/s² = Joule
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double potential(double mass, double height) {
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return mass * height * _g;
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}
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double freedPotential(double mass, double hStart, double hEnd) {
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return potential(mass, hStart) - potential(mass, hEnd);
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}
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///
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/// Kinetic energy = 0.5 [mass] * [velocity] * [velocity]
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/// with [mass] in kg and velocity in m/s and result in m²kg/s² = Joule
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double kinetic(double mass, double velocity) {
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return mass * velocity * velocity / 2;
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}
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double freedKinetic(double mass, double vStart, double vEnd) {
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return kinetic(mass, vStart) - kinetic(mass, vEnd);
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}
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///
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/// Amount of freed energy when an object changes its height from [hStart] m to [hEnd] m
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/// and changes its velocity from [vStart] m/s² to [vEnd] m/s².
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double freedEnergy(double mass, double hStart, double hEnd, double vStart, double vEnd) {
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return freedPotential(mass, hStart, hEnd) + freedKinetic(mass, vStart, vEnd);
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}
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