When I run this code I get an error "Error: Property 'pos' must be a vector." Do I have to write another vector somewhere? Because I wrote vector at
grav_force = vector(0,-object.mass*grav_field,0)
This is my whole code
GlowScript 2.7 VPython
from visual import *
display(width = 1300, height = 1000)
projectile = sphere(pos = (-5,0,0),
radius = 0.1,
color = color.red,
make_trail = True)
projectile.speed = 3.2 # Initial speed.
projectile.angle = 75*3.141459/180 # Initial angle, from the +x-axis.
projectile.velocity = vector(projectile.speed*cos(projectile.angle),
projectile.speed*sin(projectile.angle),
0)
projectile.mass = 1.0
grav_field = 1.0
dt = 0.01
time = 0
while (projectile.pos.y >=0):
rate(100)
# Calculate the force.
grav_force = vector(0,-projectile.mass*grav_field,0)
force = grav_force
# Update velocity.
projectile.velocity = projectile.velocity + force/projectile.mass * dt
# Update position.
projectile.pos = projectile.pos + projectile.velocity * dt
# Update time.
time = time + dt
Change
projectile = sphere(pos = (-5,0,0), radius = 0.1,color = color.red, make_trail = True)
to
projectile = sphere(pos = vector(-5,0,0), radius = 0.1, color = color.red, make_trail = True)
See documentation
http://www.glowscript.org/docs/VPythonDocs/sphere.html
also from documentation
How GlowScript VPython and VPython 7 differ from Classic VPython 6
· Vectors must be represented as vector(x,y,z) or vec(x,y,z), not as (x,y,z).