homework help 3.doc

# homework help 3.doc - 7E Use Fnet = F1 F2 = max where F2 is...

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7E Use F net = F 1 + F 2 = ma x , where F 2 is the second force. (a) For a x = 10 m/s 2 we have F 2 = ma x ? F 1 = (2:0 kg)(10 m/s 2 ) ? 20N = 0: Similarly, (b) F 2 = (2:0 kg)(20 m/s 2 ) ? 20N = 20N for a x = 20 m/s 2 ; (c) F 2 = (2:0 kg)(0 m/s 2 ) ? 20N = ? 20N for a x = 0; (d) F 2 = (2:0 kg)( ? 10 m/s 2 ) ? 20N = ? 40N for a x = ? 10 m/s 2 ; and (e) F 2 = (2:0 kg)( ? 20 m/s 2 ) ? 20N = ? 60N for a x = ? 20 m/s 2 : Note that F 2 < 0 means that the vector F 2 is in the negative x direction. 8E Label the two forces F 1 and F 2 . According to Newton's second law F 1 + F 2 = ma, so F 2 = ma ? F 1 . In unit vector notation F 1 = (20:0 i)N and a = (

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