問題2:(hkcee2003 paper2 Q8)
a car accelerates at 3ms-2 along a straight horizontal road. a child of mass 10kg is sitting on a safety seat inside the car. find the magnitude of the resultant force by the safety deat on the child.
A.10N
B.100N
C.104N
D.130N
why the answer is C?
中四physics的force and motion問題(mc),10分!
2007-12-01 6:57 pm
回答 (1)
2007-12-01 9:17 pm
✔ 最佳答案
remember that the force adding on child by the safety seat are contain both vertical and horizontalvertical = mg =10x10=100
horizontal = ma = 10x3 =30N
resultant force(**force is vector)= (100^2 + 30^2)^0.5
=104N
參考: myself
收錄日期: 2021-04-27 15:08:30
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20071201000051KK00898