A 1 kg mass is suspended by the light spring balance is held with a hand.
Find the reading on the spring balance if
(a) the hand remains stationary
(b) the hand moves upward with an acceleration of 5ms^-2
(c) the hand moves upward with a deceleration of 5 ms^-2
(d) the hands moves downward with an acceleration of 5 ms^-2
(e) the spring balance and the mass fall freely under gravity.
Physics (F.4) 10 marks
2006-12-09 4:07 am
回答 (1)
2006-12-09 4:16 am
✔ 最佳答案
a) F= mg = 1 * 10 =10 N
b)F-ma = mg
F = m( a+ g)
= 1 (5 + 10)
= 15N
c)F+ma = mg
= 1 (10 - 5)
= 5N
d)F +ma = mg
= 1 (10 - 5)
= 5N
e) 0 N
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