lcionline Chapter 359 Free Fall and Buoyancy
Chapter 359 Free Fall and Buoyancy
When the two men received the gold bricks and ordinary bricks with both hands, it could be clearly seen that the hand holding the gold brick was sinking down, with veins bulging and it was very strenuous.
"Now, tell me, which of these two bricks is heavier?"
"Your Highness, it's the weight of the gold bricks."
The two handed the bricks to the guards.
The onlookers were confused and didn't know why Shen Changgong asked such an idiotic question.
Everyone knows that gold bricks are heavier than red bricks, right?
Shen Changgong continued,
"Everyone, I have a question for you. If someone stands at the top of this tower and drops these two bricks together, which one will hit the ground first?"
"Gold Brick!"
"It must be the gold bricks. Gold bricks are so heavy, and red bricks are so light. The gold bricks must have fallen to the ground first."
Everyone said.
Shen Changgong nodded and said,
"Then I'll make a bet with you guys. I'll bet that it's not the gold bricks that fall to the ground first!"
When Gongsun Wan'er heard the word "bet", her legs suddenly tightened and she became nervous.
She suddenly remembered that she hadn't made a bet with Shen Changgong for a long time.
"What? How could it be that the BRICS didn't land first? We're sure to win this bet."
"I don't think it's that simple. The prince wouldn't make such a boring bet with us for no reason."
"But if they really let go at the same time, then the gold brick would fall first. Is that even a question?"
"What is your Majesty going to do?"
Looking at everyone's questioning attitude, Shen Changgong smiled with satisfaction.
Scientific experiments are produced through questioning and verification.
He went on to say,
“If I lose, everyone here will be rewarded with twenty taels of silver.
If you lose, from now on, everyone must pay close attention to my physics lessons and not be distracted again!"
"okay!"
"Row!"
"middle!"
Everyone agreed.
Then, Shen Changgong asked Tu Queling to go upstairs with the guards.
A few minutes later, three people appeared on the top floor.
The Jiutian Tower is wide at the bottom and narrow at the top. In order to prevent it from hitting the floors below, a long wooden board needs to be extended out.
Moreover, if the wooden board is tilted, it can ensure that the two bricks fall together. If it is done manually, there will always be errors.
Two bricks were placed at the front of the wooden board, and Shen Changgong had already asked everyone to step back far away to prevent anyone from being injured by broken stones.
Fortunately, there is grass around Jiutian Tower, and only one path leading to the tower gate is a stone pavement.
"Your Majesty, can we let go?"
Tu Queling above shouted loudly.
"put!"
The wooden board tilted, and everyone stared at the two bricks as they slid down the board at the same time. Then the two bricks fell in parallel at a speed that was always in a parallel line, and then there was a bang.
The audience was silent.
For a moment, their long-held firm belief seemed to be overturned.
Shen Changgong turned around and looked at everyone and asked,
"You all saw and heard it. Did the two bricks fall to the ground at the same time? Did they make only one sound?"
Everyone nodded.
"Someone, go pick up those two bricks and have everyone check to see if they've been swapped."
The guard went over and picked it up and handed it to the students for inspection.
It’s still the same two bricks as before.
Yan Fuyao's eyes were bright and he was eager to learn, but he still put on the majestic posture of an emperor and asked slowly,
"These two bricks clearly have different weights, so why did they fall to the ground at the same time?"
Shen Changgong smiled and said,
"This is physics knowledge. This is called free fall. Objects of different weights, if not affected by external forces, will fall to the ground at the same time."
Everyone nodded.
Shen Changgong continued,
"So the question is, do objects of the same weight fall to the ground at the same time or at different times?"
"They must have landed at the same time!"
Everyone answered without hesitation.
However, Tang Xinyi sensed something was wrong and quickly said,
"No, objects of different weights don't necessarily fall to the ground at the same time. If you throw a pound of cotton and a pound of iron together, the iron will definitely fall to the ground first."
"Yes, Mr. Tang said it very well. There is no doubt about that. Then why do objects of the same weight fall to the ground at different times?"
Tang Xinyi's pretty face turned slightly red, and she lowered her head and dared not speak.
She just pursed her lips quietly. What classmate Tang...
Shen Changgong snapped his fingers upwards, and everyone looked up, only to see Tu Queling holding two identical red bricks in his hands.
"You all saw that Que Ling was holding two identical bricks. They were picked up from the Imperial College's building materials pile. They're everywhere. So, if these two identical bricks were thrown together, would they land at the same time?"
Everyone said it would definitely happen at the same time.
After all, if they are the same things and have the same weight, they will definitely fall at the same time if thrown together.
Shen Changgong looked up and said to Tu Que Ling,
"let's start."
Tu Queling handed a brick to the guard, and then got busy with another guard.
A moment later, she held the brick with four strips of cloth tied to it. The other end of the strips was connected to a whole piece of white cloth, supported by another guard.
Then, Tu Queling and the guard counted down to three, two, one, and threw two bricks down at the same time.
Everyone watched as a brick fell to the ground with a thud, and the white cloth on top of another brick unfolded and slowly floated down like a parachute.
Everyone was stunned again and their cognition was refreshed.
The guards picked up the two bricks, held them up for everyone to see, and then smashed them on the ground to prove that they were real bricks.
"Your Majesty, what's going on? Aren't these two bricks the same?"
Now they all ask questions themselves, and each of them is eager to learn, with a desire for knowledge in their eyes.
Shen Changgong nodded and said,
"Yes, the two bricks are exactly the same, and the other brick has a white cloth on it, so it should be heavier. But why is the one with the cloth descending so slowly?"
Everyone widened their eyes and shook their heads.
Shen Changgong said,
"This is another point of physics: the buoyancy of air."
In this experiment, at the height of a nine-story building, Shen Changgong only dared to use bricks. If he used people to parachute, it would be the same with or without a parachute, and they would be smashed to pieces.
Tu Queling and others came down from above.
A guard came over with a stack of rice paper.
"Everyone follow me."
Shen Changgong led everyone to a pond in Jiutian Tower.
Then, he picked up two pieces of rice paper and said to everyone,
"These are two identical pieces of paper. Have you seen them?"
"Yes."
Now everyone is convinced and answers all the questions.
Shen Changgong casually crumpled a piece of paper into a ball, and then folded another one into a paper airplane.
"If these two identical pieces of rice paper are thrown out at the same time, which one will land first?"
Wen Lu quickly answered,
"It's the pointed one on your right hand. I don't know why, but I'm sure it's that one."