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Showing some concepts of Turtle and Physics.

import turtle
import random

wn = turtle.Screen()
wn.bgcolor("black")
wn.tracer(0)

balls =[]

for _ in range(25):
    balls.append(turtle.Turtle())

colors = ["red", "blue", "green", "orange", "yellow", "purple", "white"]
shapes = ["circle", "triangle","square"] 
for ball in balls:    
    ball.shape(random.choice(shapes))
    ball.color(random.choice(colors))
    ball.penup()
    ball.speed(0)
    x = random.randint(-190,190)
    y = random.randint(-190,190)
    ball.goto(x,y)
    ball.dy = 0
    ball.dx = random.randint(-3,3)
    ball.da = random.randint(-5,5)

gravity = 0.1

while True:
    wn.update()
    
    for ball in balls:
        ball.rt(ball.da)
        ball.dy -= gravity
        ball.sety(ball.ycor() + ball.dy)
        
        
        ball.setx(ball.xcor() + ball.dx)
        
        
        # Check for wall collision
        if ball.xcor() > 190:
            ball.dx *= -1
            ball.da *= -1
            
        if ball.xcor() < -190:
            ball.setx(-190)
            ball.dx *= -1
            ball.da *= -1
            
        # Check for a bounce
        if ball.ycor() <-190:
            ball.sety(-190)
            ball.dy *= -1
            ball.da *= -1

Turtle #5 - Bouncing ball simulation