horizontal motion code physics

physics/horizontal_projectile_motion.py

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+"""
+Horizontal Projectile Motion problem in physics.
+This algorithm solves a specific problem in which
+the motion starts from the ground as can be seen below:
+      (v = 0)
+        **
+       *  *
+      *    *
+     *      *
+    *        *
+   *          *
+GROUND      GROUND
+
+For more info: https://en.wikipedia.org/wiki/Projectile_motion
+"""
+
+# Importing packages
+from math import pi, sin
+
+# Acceleration Constant on hearth (unit m/s^2)
+g = 9.80665
+
+
+def angle_to_radians(angle : float) -> float:
+    """
+    Convert an angle from degrees to randians
+    """
+    return angle * pi / 180
+
+
+def horizontal_distance(init_velocity: float, angle: float) -> float:
+    """
+    Returns the horizontal distance that the object cover
+
+    Formula:
+            v_0^2 * sin(2 * alpha)
+            ---------------------
+                   g
+
+    v_0 - initial velocity
+    alpha - angle
+
+    >>> horizontal_distance(30, 45)
+    91.77
+    >>> horizontal_distance(100, 78)
+    414.76
+    """
+    radians = angle_to_radians(2 * angle)
+    return round((init_velocity ** 2) * sin(radians) / g, 2)
+
+
+def max_height(init_velocity: float, angle: float) -> float:
+    """
+    Returns the maximum height that the object reach
+
+    Formula:
+            v_0^2 * sin^2(alpha)
+            --------------------
+                   2g
+
+    v_0 - initial velocity
+    alpha - angle
+
+    >>> max_height(30, 45)
+    22.94
+    >>> max_height(100, 78)
+    487.82
+    """
+
+    radians = angle_to_radians(angle)
+    return round(((init_velocity ** 2) * (sin(radians)) ** 2) / (2 * g), 2)
+
+
+def total_time(init_velocity: float, angle: float) -> float:
+    """
+    Returns total time of the motion
+
+    Formula:
+            2 * v_0 * sin(alpha)
+            --------------------
+                   g
+
+    v_0 - initial velocity
+    alpha - angle
+
+    >>> total_time(30, 45)
+    4.33
+    >>> total_time(100, 78)
+    19.95
+    """
+
+    radians = angle_to_radians(angle)
+    return round((2 * init_velocity) * (sin(radians)) / g, 2)
+
+
+def test_motion() -> None:
+    """
+    >>> test_motion()
+    """
+    v0, angle = 25, 20
+    assert 40.97 == horizontal_distance(v0, angle)
+    assert 3.73 == max_height(v0, angle)
+    assert 1.74 == total_time(v0, angle)
+
+
+if __name__ == "__main__":
+
+    # Get input from user
+    init_vel = float(input("Initial Velocity: "))
+
+    # Get input from user
+    angle = float(input("angle: "))
+
+    # Ensure valid angle
+    if angle > 90 or angle <= 0:
+        print("Error: Invalid angle. Range is 1-90 degrees.")
+
+    # Ensure valid velocity
+    elif init_vel < 0:
+        print("Error: Invalid velocity. Should be a positive number.")
+
+    # Print results
+    else:
+        print()
+        h_dis = str(horizontal_distance(init_vel, angle))
+        v_dis = str(max_height(init_vel, angle))
+        t_time = str(total_time(init_vel, angle))
+        print("Results: ")
+        print("Horizontal Distance: " + h_dis + " [m]")
+        print("Maximum Height: " + v_dis + " [m]")
+        print("Total Time: " + t_time + " [s]")