only 19 5.4 Normal Forces 19, Suppose you stand on a spring scale in six identic

Question

only 19

5.4 Normal Forces 19, Suppose you stand on a spring scale in six identical elevators. Each elevator moves as shown cie readings S to So, Some may be equal. Give your answer in the form A > B b. If the initial velocity c distance the block sli Let the reading of the scale in elevator n be Sr Rank in order, from largest to smalle six scale 21. Consider a box in the a. If the truck accelex forces act on the b Down Slowing at 2 m/s at 3 ms Steady at 2 at 3 mvs b. Draw a free-bo Speeding up at 2 nv's Down at 3 m/s Speeding up at 2 m/s at 6 m/s Down at 3 m/'s Falling Order Explanation c. What happer basing your

Explanation / Answer

Apply Newtons second law along y direction in all cases

F net = ma

(1)

N-mg= ma

N = mg+ ma

N>W

(2)

N- mg = ma

N= mg+ ma

N>W

(3)

mg- N = ma

a= 0 because elevator moving with steady speed

mg = N

(4)

N- mg = ma

N= mg+ ma

N>W

(5)

N+ mg= ma

N = ma- mg

N< W

(6)

in free falling a= g

N = m( a- g)= 0

so normal force rank in order from largest to smallest is

1= 2= 4 >3>5>6

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