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★ <u>Remember</u> :
The reading of scale of a man in an elevator :
- When the elevator moves upward with acceleration a, R = m(g + a)
- When the elevator moves downwards with acceleration a , R = m(g - a)
- When the elevator falls freely, we take a = g so, R = m(g - g) = 0
- When the lift is at rest or moves with uniform velocity, a = 0, so R = m(g - 0) = mg
A). The elevator moves up at a constant speed
∴ Acceleration of elevator = 0
➠ R = mg
➠ 53 × 10
➠ <u>R = 530N</u>
B). It slows at 2m/s² while moving upward.
∴ Acceleration of elevator = -2m/s²
[Negative sign shows that speed decreases with time]
➠ R = m(g + a)
➠ R = 53(10 + (-2))
➠ R = 53 × 8
➠ <u>R = 424N</u>
C). It speeds up at 2m/s² while moving downward.
∴ Acceleration of elevator = 2m/s²
➠ R = m(g - a)
➠ R = 53(10 - 2)
➠ R = 53 × 8
➠ <u>R = 424N</u>
D). It moves downward at constant speed.
∴ Acceleration of elevator = 0
➠ R = mg
➠ R = 53 × 10
➠ <u>R = 530N</u>
<h3>Hope It Helps!</h3>