點解升降機向上加速會令體重上升

你個人向上加速緊, By Newton first law, 有個net Force 向上.
Net force = normal force(向上) - gravitational force(向下)
normal force 係from升降機底/磅to 你隻腳既
而個磅係read 緊你個normal force, 即係Gforce + net upward force, 所以會個磅會read 重左.

另外你問既 weight1 = weight2 + NF係岩既
原先個磅(i.e.靜止果時) 係read normal force(上) = weight = -mg(下)
而家向上accelerate:
個磅read normal force(上) = mg(下) + ma(上)
mg 不變,而家多左個ma 係同normal force 同一方向,所以個磅量個數係大左

有錯請指點

其實阿，要使身材變苗條的不二法門就是「吃進去的熱量一定要小於每日消耗的熱量」

只要掌握這個原則，自然而然就一定可以變窈窕啦！

如果想讓自己健康又美美的瘦下來，推薦給你一個好東西【我自己也有在吃】

有一種低卡珍珠米是用蒟蒻做成的米，低脂肪、低熱量、膳食纖維又多

不用挨餓吃的又健康，只要照著他的方法加在白米飯裡面吃(網頁有附方法說明)

不僅吃了有飽足感，料理上也很方便

重點是他的熱量很低，每天慢慢的減少好幾百卡，一個月下來就少7740卡

不知不覺吃的又健康又可以保持身材，真的是一舉兩得呢!!

有興趣的可以參考看看喔

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首先,weight =地球施力比人,,
我地量體重係量緊個normal reaction force

and then,,當lift向上加速個陣,,weight依然係施加向下既,咁樣,,lift同個人接觸增加左,lift比個force比人向上(normal reaction force),,人施加比lift既force(normal reaction force既reaction force)會增加左,,同樣normal reaction force一樣增加,,所以weight係增加左
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公式篇:
F=ma
w=mg

W-R=m(a)
when a=0 W=R"

when a increase,,take +position is downward
W-R=m(-a)
w+ma=R

R>R"

2010-08-22 19:23:59 補充：
正確黎講唔係WEIGHT增加,係你感受到增加左,,係normal reaction force 既reaction force增加左

The simple explanation is that when the lift is accelerating upward, the floor of the lift tends to travel faster than your body. Because the lift floor cannot pass through your body, it then tries pushing your feet to make your body to travel as fast as the lift floor. Under such situation, you feel a force on your feet pushing you upward. That's why you feel your body weight increases.

體重 is depend on the normal reaction.
weight=mg
normal reaction acting on body at rest=R
acceleration of body=a

原本體重 =mg =R

當升降機向上加速

normal reaction acting on body 當升降機向上加速 = R'

R' - mg =ma
R' =ma +mg

R' >R

體重上升