어과수
2023-01-04 14:56
테니스 라켓에 밀가루를 묻히고 라켓을 움직이면,
밀가루가 라켓 모양 그대로 잠시 붕 떠 있을 수 있어요!
그건 관성 때문이지요.
관성의 원리 영상으로 확인해 보세요.
Severity: Notice
Message: Undefined variable: total
Filename: templates/commentlist.php
Line Number: 8
Backtrace:
File: /var/www/html_dev/mkids_dongascience_com/application/views/templates/commentlist.php Line: 8 Function: _error_handler
File: /var/www/html_dev/mkids_dongascience_com/application/views/kids_tv/viewContents.php Line: 82 Function: view
File: /var/www/html_dev/mkids_dongascience_com/application/controllers/Kids_tv.php Line: 128 Function: view
File: /var/www/html_dev/mkids_dongascience_com/www/index.php Line: 301 Function: require_once
A PHP Error was encountered
Severity: Notice
Message: Undefined variable: total
Filename: templates/commentlist.php
Line Number: 8
Backtrace:
File: /var/www/html_dev/mkids_dongascience_com/application/views/templates/commentlist.php
Line: 8
Function: _error_handler
File: /var/www/html_dev/mkids_dongascience_com/application/views/kids_tv/viewContents.php
Line: 82
Function: view
File: /var/www/html_dev/mkids_dongascience_com/application/controllers/Kids_tv.php
Line: 128
Function: view
File: /var/www/html_dev/mkids_dongascience_com/www/index.php
Line: 301
Function: require_once