2025-plovdiv-scientific-patterns/class_materials/exercises/particle_update_position.ipynb

Exercise: Add the function update_position to the Particle class¶

• Make the function update_position into a method of the class Particle
• Where do the position position of the particle belong? Modify the class constructor if necessary
• Once it is done, create a particle with mass 2.1 with velocity 0.8 at position 8.2 . Update the position with dt=0.1 and print out the new location.

In [10]:

def update_position(velocity, position, dt):
    return position + velocity * dt

In [11]:

class Particle:
    def __init__(self, mass, velocity, position):
        self.mass = mass
        self.velocity = velocity
        self.position = position

    def momentum(self):
        return self.mass * self.velocity

    def update_position(self, dt):
        self.position = self.position + self.velocity * dt
        return self.position

particle = Particle(mass=2.1, velocity=0.8, position=8.2)
print(particle.momentum())

1.6800000000000002

In [12]:

position = 8.2
new_position = update_position(particle.velocity, position, dt=0.1)
print(new_position)

8.28

In [13]:

dt=0.1
particle.update_position(dt)

Out[13]:

8.28

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