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A 50 kg woman gets on an elevator at the ground floor [0h floor] of a skyscraper and pushes a button. The elevator accelerates upwards at 3 m/s? for 2s, then maintains a constant velocity for 2s, and then decelerates at 2 m/s² until it stops at her desired floor. A) If the skyscraper's floors are each 3 meters, what button did she push? B) During the upwards acceleration, does the normal force (from the floor of the elevator) or the force of gravity do more work? By how much? C) During the constant velocity part of the ride does the normal force or the force of gravity do more work? By how much? D) During the deceleration part does the normal force or the force of gravity do more work? By how much? E) For the total elevator ride, which force does more work? Could you have known this without doing any calculation?

A 50 kg woman gets on an elevator at the ground floor [0h floor] of a skyscraper and pushes a button. The elevator accelerates upwards at 3 m/s? for 2s, then maintains a constant velocity for 2s, and then decelerates at 2 m/s² until it stops at her desired floor. A) If the skyscraper's floors are each 3 meters, what button did she push? B) During the upwards acceleration, does the normal force (from the floor of the elevator) or the force of gravity do more work? By how much? C) During the constant velocity part of the ride does the normal force or the force of gravity do more work? By how much? D) During the deceleration part does the normal force or the force of gravity do more work? By how much? E) For the total elevator ride, which force does more work? Could you have known this without doing any calculation?

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1:20 PM Sun Apr 10 ... 2) 2. A 50 kg woman gets on an elevator at the ground floor [0th floor] of a skyscraper and pushes a button. The elevator accelerates upwards at 3 m/s? for 2s, then maintains a constant velocity for 2s, and then decelerates at 2 m/s? until it stops at her desired floor. A) If the skyscraper's floors are each 3 meters, what button did she push? B) During the upwards acceleration, does the normal force (from the floor of the elevator) or the force of gravity do more work? By how much? C) During the constant velocity part of the ride does the normal force or the force of gravity do more work? By how much? D) During the deceleration part does the normal force or the force of gravity do more work? By how much? E) For the total elevator ride, which force does more work? Could you have known this without doing any calculation? v,'s V;²-2 ad 2 d; 9m 2m/s? until stop 1 az d: vb:6"/s· 2s:12m v: constant a =0 Ve :0 3m a 3m/s' for 2s 1.3m1s².2s`com V:0 (om /s
Transcribed Image Text:1:20 PM Sun Apr 10 ... 2) 2. A 50 kg woman gets on an elevator at the ground floor [0th floor] of a skyscraper and pushes a button. The elevator accelerates upwards at 3 m/s? for 2s, then maintains a constant velocity for 2s, and then decelerates at 2 m/s? until it stops at her desired floor. A) If the skyscraper's floors are each 3 meters, what button did she push? B) During the upwards acceleration, does the normal force (from the floor of the elevator) or the force of gravity do more work? By how much? C) During the constant velocity part of the ride does the normal force or the force of gravity do more work? By how much? D) During the deceleration part does the normal force or the force of gravity do more work? By how much? E) For the total elevator ride, which force does more work? Could you have known this without doing any calculation? v,'s V;²-2 ad 2 d; 9m 2m/s? until stop 1 az d: vb:6"/s· 2s:12m v: constant a =0 Ve :0 3m a 3m/s' for 2s 1.3m1s².2s`com V:0 (om /s
1:20 PM Sun Apr 10 *e 79% D For the total elevator ride, which force does more work? Could vou have known this without doing any calculation? 0:6mis?-: d: 9m -2. 2"/s² d 1 a: 2m/s until Stop d. vb:l6"/s· 2s= 12m v- constant aso a 3m/s' for 2s d. V = at : 3m/s. 2s= 6m/s lom+ 12mt9m = 27m 27m :9h button 3m B) Img Nimlang) : (640 N Wys N.d, = (64ON: lom 3840J Ng:mgd. SOkg.9.8/s*. om = 2940 J Wy-Nq=900 J 4 Work done by the normal force Is 900 J larger. 15 C) Durng constant acc. AN:0, so ame as befor e.
Transcribed Image Text:1:20 PM Sun Apr 10 *e 79% D For the total elevator ride, which force does more work? Could vou have known this without doing any calculation? 0:6mis?-: d: 9m -2. 2"/s² d 1 a: 2m/s until Stop d. vb:l6"/s· 2s= 12m v- constant aso a 3m/s' for 2s d. V = at : 3m/s. 2s= 6m/s lom+ 12mt9m = 27m 27m :9h button 3m B) Img Nimlang) : (640 N Wys N.d, = (64ON: lom 3840J Ng:mgd. SOkg.9.8/s*. om = 2940 J Wy-Nq=900 J 4 Work done by the normal force Is 900 J larger. 15 C) Durng constant acc. AN:0, so ame as befor e.
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