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# how to calculate force required to lift a 40 kg mass? Answered

i want to throw a 30-40 kg opponent robot in a robowar in air! i wanna lainch it in air, that is the attack strtegy am using...please help me to find th e force required to do that. thanks in advance!

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## 9 Replies

steveastrouk (author)2009-10-12

400 N should do it then.

sarathjulius (author)2009-10-13

based on wat calculation bro?  thanks!

steveastrouk (author)2009-10-14

Exactly as smoked says below.

Smokedasphalt (author)2009-10-12

To lift up <em>vertically</em>, you will need to use Force=mass x gravity.<br />For 40kg, a force greater then 392N is required.<br /><br />You build robots and you don't know how to calculate force?? Wow....<br />

Re-design (author)2009-10-12

Lots of people build things and don't know the numbers.  They have very good intuition.  And they don't stop at the first failure.

Wish I had learned a few more of the numbers when I was younger!

Smokedasphalt (author)2009-10-12

Yeah, i know, but a guy can't calculate force and he wants to build a robot??? Thats basic!

kelseymh (author)2009-10-12

At least 392 newtons.

steveastrouk (author)2009-10-12

Since you want to THROW it in the air, its not that simple to work out. You need to accelerate it to some speed. How high ? How long in time and distance have you got to accelerate it ?

sarathjulius (author)2009-10-12

about 2 to 3 feet is sufficient dude:)...just to scoop the opponent and launch it in air so that it would topple.