# My Parachute Sim Js v 5.3

- Author:
- rasheedgadir

## Parachute Jump Simulator

**Parameters:**Students can use time acceleration from 0.25 to 4 X to speed up or slow down the sim. Air Resistance coefficient before deployment is 0.29 kg/m After deployment, coefficient is adjustable. Typical value is 13.0 kg/m. Students can also:

- Select the mass of Jumper + parachute .
- Select the initial altitude AGL
- Select the speed of the plane.
- Select the wind speed and wind direction. Tip: Use the graph view tool to drag and adjust the x and y axes.

**The model:**Both Quadratic & linear drag models where used ( The vertical motion is based on quadratic drag.. Chute deployment takes a typical 3 s period, during which the drag increases linearly from c1 to c2.. Horizontal drag coefficient is the same c1 until parachute deployment. Mr. Rasheed

## Q1 Sim :

## Q1: The effect of Air Resistance:

1- Click on **[New Sim]** and select an initial altitude( Height above ground level) and mass (Typical mass of a parachute is 14 kg), then click **[Finish].**
2- Start the simulation and allow the jumper to fall freely **WITHOUT **deploying the parachute. Note the **vertical velocity** of the jumper when he hits the ground.
3- Calculate the vertical velocity of the jumper, and total time of the jump if there was no air resistance.
4- Compare and comment on your results from 2 & 3 above.

## Q2: Parachute Deployment:

Give a practical reason why the parachute **should not** be deployed **immediately **after jumping off the plane.

## Q3 Sim :

## Question 3: The Graph

Reset the simulation, and start a new jump.
This time, deploy the parachute at a safe altitude. (If you deploy the chute at high altitude, the jump will take longer to complete).
Check the [Show graph] checkbox to display the **velocity - time graph,
**Use the **point tool** and **text tool ** to create and label the following points:
**(IMPORTANT : DO NOT RESET THE SIMULATION AFTER ANSWERING Q1 TO Q5 BELOW)**

- A point labelled
**U**, where the jumper was moving with uniform acceleration. Give an**estimate**of the value of this acceleration. - A point labelled
**T**, when jumper was falling with terminal velocity. - A point labelled
**D**, where the acceleration was decreasing. - a point labelled
**M**, when jumper was decelerating at rate close to the maximum deceleration.

**D**was decreasing.

On a different high altitude jump, another jumper with a total mass of 90 kg, jumped from 5,000 m. He deployed his parachute at 800 m. Calculate the magnitude of air resistance when he was 50 m above the ground.