Clear Filters
Clear Filters

How do i create a projectile?

6 views (last 30 days)
Adriana Diaz
Adriana Diaz on 26 Nov 2019
Answered: Jim Riggs on 27 Nov 2019
Provided the properties of an object and initial conditions, simulate the path the object will follow as a projectile, including air resistance. Note that for air resistance you may use a simplified drag equation: Drag Force = Drag Coefficient x Velocity2
Input: initial x,y position and velocity, object mass and drag coefficient, gravitational acceleration Built in Logic: Check whether the object is has hit the ground (y=0) and terminate the simulation if so (use the break function) Animation Plot: Object position in time Summary Plot: Your choice of one variable Output: Distance travelled, and your choice of at least one other variable
James Tursa
James Tursa on 26 Nov 2019
What have you done so far? What specific problems are you having with your code?
Adriana Diaz
Adriana Diaz on 26 Nov 2019
I need help starting it.

Sign in to comment.

Answers (2)

Philippe Lebel
Philippe Lebel on 26 Nov 2019
Edited: Philippe Lebel on 26 Nov 2019
as example for a non-accelerating projectile (which is not your case) this could look like
time = 0:1:100; % time goes from 0 to 100 seconds for example
initial_position = [0,0]; % [x,y]
initial_velocities = [10,5];
position_x = initial_velocities(1)*t + initial_position(1);
position_y = initial_velocities(2)*t + initial_position(2);
the drag force provides an acceleration against the direction of movement (in x AND y) you will need to use cinematics equations such as:
x(t) = 0.5*acceleration_x * t^2 + inti_vel_x * t + init_pos_x;
and forces equations such as:
acceleration = Forces/mass
i hope this hint will get you going.

Jim Riggs
Jim Riggs on 27 Nov 2019
Always start by making a drawing of the problem.
  • Define the coordinate system (which way is positive/negative)
  • What are the parts of the system and their interconnections/relationships (topology)
  • Define variable quantities and names
For Kinetic/kinematic analysis, draw a free-body diagram of the system
  • Label forces, displacements, angles, velocity vectors, acceleration vectors
  • Check sign conventions on all parameters
Using your drawings, define mathematical relationships using the nomenclature and sign conventions from your drawing.
For a trajectory model, you will define the initial condition, then integrate the equations of motion over some period of time (i.e. a loop in the program), until some condition is reached (vertical position goes below the ground or time limit is reached - you need a mathematical expression for this condition). Use this condition to exit the loop.


Find more on Simulation in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!