A spring balance is attached to the ceiling of a lift. When the lift i

1.	A spring balance is attached to the ceiling of a lift. When the lift is at rest spring balance reads 49 N of a body hang on it. If the lift moves:1. Downward 2. upward, with an acceleration of 5 ms2 3. with a constant velocity.What will be the reading of the balance in each case?
Answer» 1. R = m(g – a) = 49 N so = m = \(\frac{49}{9.8}\) = 5 kg R = 5 (9.8 – 5) R = 24 N 2. R = m(g + a) R = 5 (9.8 + 5) R = 74 N 3. as a = 0 so R = mg = 49 N

A spring balance is attached to the ceiling of a lift. When the lift is at rest spring balance reads 49 N of a body hang on it. If the lift moves:1. Downward 2. upward, with an acceleration of 5 ms2 3. with a constant velocity.What will be the reading of the balance in each case?

Answer»

1. R = m(g – a) = 49 N

so = m = \(\frac{49}{9.8}\) = 5 kg

R = 5 (9.8 – 5)

R = 24 N

2. R = m(g + a)

R = 5 (9.8 + 5)

R = 74 N

3. as a = 0 so R = mg = 49 N