function calculating the forces acting inbetween 2 stars

1 files changed, 31 insertions, 0 deletions

diff --git a/force.go b/force.go
new file mode 100644
index 0000000..a839459
--- /dev/null
+++ b/force.go
@@ -0,0 +1,31 @@
+package main
+
+import (
+	"math"
+)
+
+// forces_acting calculates the force inbetween the two given stars s1 and s2
+// The function return the force
+func forces_acting(s1 star, s2 star) force {
+
+	// Gravitational constant
+	var G float64 = 6.674 * math.Pow(10, -11)
+
+	// Distance between the stars
+	var r21 float64 = math.Sqrt(math.Pow(s2.c.x - s1.c.x, 2) + math.Pow(s2.c.y - s1.c.y, 2))
+
+	// Unit vector pointing from s1 to s2
+	rhat := force{s2.c.x - s1.c.x, s2.c.y - s1.c.y}
+
+	// Calculate how strong the star is affected
+	var F_scalar float64 = G * (s1.mass * s2.mass) / math.Pow(math.Abs(r21), 2)
+
+	// Calculate the overall force by combining the scalar and the vector
+	var Fx float64 =  F_scalar * rhat.x
+	var Fy float64 =  F_scalar * rhat.y
+
+	// Pack the forces in a force structur
+	F := force{Fx, Fy}
+
+	return F
+}