include script that depends on modernizr?

I assume these are child theme scripts because of your function name:

twentyfourteen_child_scripts()

When loading scripts from your child themes functions file you should use:

wp_enqueue_script( '$handle', get_bloginfo( 'stylesheet_directory' ) . '/js/filename.js', array( 'jquery' ), '1.0.0' );

Or use

add_action( 'wp_enqueue_scripts', 'child_add_modernizr_scripts' );

function child_add_modernizr_scripts() {
wp_register_script('modernizr', get_stylesheet_directory_uri() . '/js/modernizr.js', false, '1.0', true );

wp_enqueue_script( 'modernizr' );
}

Another potential problem maybe the file names are invalid for some reason.

get_template_directory_uri()

Applies to parent themes.