(2) An increasing unbalanced force is needed to keep an object moving with uniform acceleration.
呢個點解唔岩??
CE phy 1996 mc5
2009-08-13 11:34 pm
回答 (3)
2009-08-14 4:32 am
"An increasing unbalanced force is needed to keep an object moving with non-uniform acceleration." - this sentence will then be correct.
A constant net force gives a uniform acceleration, hence an increasing unbalanced force will give an acceleration that increases with time, which is not an uniform acceleration.
A constant net force gives a uniform acceleration, hence an increasing unbalanced force will give an acceleration that increases with time, which is not an uniform acceleration.
2009-08-14 2:51 am
Unbalanced force also means the net force.Although there may be several forces acting on the object,the Newton's second law can still solve this problem.According to the Newton's second law,Net force=mass x acceleration,where mass is always constant.So a constant unbalanced force is need to keep the object moving with uniform acceleration.
2009-08-14 1:24 am
要保持物體有恆定的加速度,就需要施加一個不斷增加的不平衡力
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