Why do smaller asteroids move towards earth more frequently than larger asteroids?

Smaller asteroids move toward Earth more frequently than larger ones primarily due to their greater numbers and higher velocity. The population of smaller asteroids is significantly larger, and they are often part of the debris from collisions or fragmentation of larger bodies in the asteroid belt. Additionally, smaller asteroids can have less stable orbits, making them more susceptible to gravitational perturbations from planets, which can alter their paths and direct them toward Earth.