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klafterreith



Joined: 25 Nov 2005
Posts: 429
PostPosted: Thu Mar 06, 2008 5:57 am    Post subject: balloon Reply with quote
IT NEEDS 10 tonnes to push the balloon under water.

IT TAKES 10 tonnes to push the balloon under water.


Which one is correct? Are both okay?
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lotus



Joined: 25 Jan 2004
Posts: 862
PostPosted: Thu Mar 06, 2008 8:24 am    Post subject: Reply with quote
Hi,

I would use "takes" or "needed."

It takes 10 tonnes to push the balloon under water.
10 tonnes was needed to push the balloon under water.

Officially, 10 tonnes is a mass (10,000 kg), not a force. Force would be in Newtons.


--lotus
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