Simple physics of when an object is dropped from an airplane

The motion of the dropped object within 10 seconds after leaving the aircraft is a constant speed in the horizontal direction and a free fall in the vertical direction.

So at 10 seconds, the dropped object moves in a vertical direction h1=(1 2)*gt 2=

The horizontal direction moves s1 = v0 * t = 100 * 10 = 1000 (m).

100 of which is the converted result.

When the parachute is opened in 10 seconds, it moves at a constant speed; It is also known that horizontal movement is not affected by parachutes.

The inference horizontal minute velocity is still 100 m/s after 10 seconds.

In order to conform to the theme, the object moves at a uniform speed after the parachute is opened, so the vertical minute velocity is 100 meters per second after 10 seconds.

At 10 seconds, the object is 1000 meters above the ground, so it will take 1000 100 = 10 seconds for the object to reach the ground after the parachute is opened. During these 10 seconds, the object moves horizontally again: s2 = 10 * 100 = 1000 (meters).

Therefore, the distance between the launch point and the designated landing point should be S1 + S2 = 2000 meters.

It is to calculate the horizontal displacement.

At 10 seconds: y=1 2at2=1 2*10*100=500mAt this time: vx=360kmh=100ms

vy=at=10*10=100m/s

vy=vx, so it falls at a 45 degree angle.

1500-500 = 1000m above the ground

So s=1000*1+500=1500m

That is, it is placed at a distance of 1500m.

Among them, "it is known that the parachute opens when the dropped object leaves the aircraft for 10 seconds, that is, it moves at a constant speed" means that the current VX and VY can remain unchanged after the parachute is opened.

If you throw something out at a high speed and fall down, it doesn't seem to be affected by the aircraft at that time.

Paper airplanes want to fly far and fast, there are a few things to pay attention to:

1) Try to fold both sides symmetrically, if it is not symmetrical, the plane is easy to turn, and it will not fly far;

2) The ratio of wings to the fuselage should be appropriate. The fuselage is small and the wings are large, and the lift of the aircraft is enough, but the center of gravity is raised, and the plane thrown out is easy to flutter; The fuselage is large and the wings are small, the center of gravity is too downward, and the plane is like a dart, full of inertia, but it has lost the flight and gliding trip, as if it is a ball of paper thrown out. The correct and reasonable ratio of wings and fuselage should be determined according to the shape of the paper airplane and the texture of the paper.

3) Pay attention to the balance between the front and back. The nose of the aircraft is too heavy, and the plane is easy to plunge headlong into the ground; The nose is too light, and it is easy to cause the nose to tilt, resulting in stalling. The balance of the aircraft can be adjusted by adjusting the shape of the paper airplane, or by making appropriate loading with strips of paper or tape (if allowed);

4) Finally, the throwing of paper airplanes is also very particular: do not throw crosswind, otherwise it is easy to be scraped off; There is also not enough power to throw downwind; It is best to throw against a not too strong headwind, the angle of the throw is slightly greater than the horizontal angle, about 15 degrees, the plane should be sent forward smoothly, and it will not be taken off naturally until the last moment, so that it will fly the farthest.

Anyone can fold paper airplanes, even if you look at the picture can not do the same as mine, I will not send the picture, the key is to explore more yourself, to find out the best paper airplane structure and throwing strength.

When folding the plane, make the plane as symmetrical as possible.

Ha breathe, let the nose become heavier, the center of gravity in front, the inertia will be large, understand??

Before the plane drops the relief materials, the relief materials and the plane have the same speed

After the relief materials left the plane, due to inertia, they had to keep the original state of motion, and continued to move forward in the process of falling

In order to ensure that disaster relief materials are in place, it is necessary to put them in advance

If air resistance is ignored, objects thrown from an airplane traveling at a constant speed appear to be directly below the airplane all the time. This is because the dropped object also keeps moving forward at the horizontal velocity of the aircraft. However, it is again moved downward by gravity at the speed of a free-fall until it hits the ground.

Therefore, its duration is the time from leaving the aircraft to landing on the ground.

From the ground, the dropped object moves in a parabolic motion.