For questions 1-5, consider the 50.-kg woman shown in the elevator at right. For

Question

For questions 1-5, consider the 50.-kg woman shown in the
elevator at right. For each question, sketch a force diagram
and find the value of each force acting on the woman.
Assume the elevator moves vertically and upward is
positive.
1. The elevator moves with a constant velocity of +2.0 m/s.
2. The elevator moves with a constant velocity of -3.0 m/s.
3. The elevator moves downward with a velocity of -4.0
m/s and has an acceleration of +1.0 m/s2.
4. The elevator moves upward with a velocity of +3.0 m/s
and has an acceleration of +1.0 m/s2.
5. The elevator moves downward with a velocity of -4 m/s
and has an acceleration of -2.0 m/s2.

Explanation / Answer

in first and second case, the acceleration is zero because velocity is constant so no outside force is applied on women.

only force would be due to her weight.

in third and fourth case acceleartion is upwards,upwards force=50*1 N

where as weight is downwards

in fifth case, acceleration is also downwards, downward force=50*2 N

weight is also downwards

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