Two 5-N forces act at the same point. What should the angle between the two forces be if the resultant is also 5 N in magnitude?
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中四physics mechanics既一條問題.....
2007-05-27 11:51 pm
回答 (2)
2007-05-28 4:26 am
✔ 最佳答案
to calculate the result force, let the angle between between two force is θ( 5 + 5 ) cos(θ/2) = 5
cos(θ/2) = 0.5
θ/2 = 60
θ= 120
remark: each of the force can be resolved into 2 component, one is Fcos(θ/2) and another is Fsin(θ/2). for the direction cos(θ/2) , two component forces are in the same direction and can then be added up dirctly, for the direction sin(θ/2) the 2 component forces are in opposite direction and they cancel each other.
2007-05-28 12:03 am
the angle is 90 degrees
a force can't influence other forces in 90 degree
a force can't influence other forces in 90 degree
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