Table of Contents ! 1. Aristotle’s Free Fall ! 2. Aristotle’s Flotation ! 3. The Telescope ! 4. The Thermometer ! 5. The Pendulum ! 6. Pictures
Aristotle’s Free Fall ! The great Aristotle got some of his theories incorrect, but most of them were right, and he changed the world. ! Aristotle said that heavier objects fell faster than lighter objects. Galileo tested it, and discovered that Aristotle was wrong. Gravity eﬀects everything the same. ! Because of our greater understanding of gravity, we will be able to discover more things with our knowledge. We have traveled to the moon and back, and perhaps may go even further next time. Here’s a video:
Aristotle’s Flotation ! Aristotle said that shape alone eﬀects whether something ﬂoats. To ﬂoat, an object must be thin, ﬂat and smooth, or a smooth sphere. ! Galileo tested this theory. He said that an object must be less dense than water to ﬂoat, and he was right. ! Because Galileo did this, we are now able to make ﬂoating pool toys and boats. Columbuss and Cook’s boats were made of wood. Wood ﬂoats. Their discovery changed the world, and Galileo secretly helped them to victory.
The Telescope ! In 1609 a man named Hans Lippershey invented the telescope. It could see objects that appeared to be a few steps away, and the image was up-‐side-‐down. ! Galileo decided he could improve the telescope, and he did. His was much more powerful, and the picture was not up-‐side-‐down. ! With the telescope, people could know if an army was attacking, or a rock was in front of a ship, or, like Galileo, you could see the stars and the planets. We went to the moon because we saw it in Galileo’s telescope and got curious. He changed the world.
The Thermometer ! People needed a way to tell the temperature outside or inside, and Galileo was the man for the job. ! Galileo was taking medical school at the University of Pisa. His ﬁrst invention was the thermometer. ! People wanted to know how cold or hot it was, so the thermometer was created. It changed the world because you may not know if it’s cold enough for a jacket, and then you get sick, and you could die in the old days, so one of Galileo’s discoveries once again saved people’s lives, and an important person, such as Columbus, could have get sick and die and we would still think the world was ﬂat.
The Pendulum ! Doctors needed a better way to tell for a person’s pulse. Clocks were to unreliable and incorrect. ! Galileo saw a regularly swinging lamp at the church one Sunday. He measured the swings with his pulse. He began Pendulum experimenting. ! Clockmakers could make accurate clocks so people would know when something started or ended or how long something took. Doctors made a device called a pulsilogia, which measures a patient’s pulse. Once again, one of Galileo’s discoveries saved people’s lives.