Elevators use counterweights, which are powered via gravity to help move themselves. while elevators have engines to power their movement, but they are greatly aided with the use of counterweights.
Counterweights use gravity to aid elevators with about 40-50 percent of their load. When the elevator goes up, the counterweight goes down and vice-versa. If the elevator is empty then there are brakes to slow down the force created by the counter weights.
Of course, the counter weights are unable to power the elevator fully meaning that you still have to use other parts to move the elevator. Counterweights in elevators have been used to aid in lifting people up high buildings.
https://www.explainthatstuff.com/how-elevators-work.html
Friday 16 August 2019
A short write up of Galileo Galilei q3
Galileo was born in Florence on the 15th of February 1564, nearing the end of the Renaissance, it was a time of discovery with several other prominent scientist living around this time, such as Leonardo da Vinci, Issac Newton, and Nicolas Copernicus. This meant that most new scientific theories were accepted, and many great thinkers could work on those theories. I.e. this was a much better time to be a scientist then the times before the Renaissance.
His major contributions to science include his improved telescope from the original design which allowed him to see craters on the moon and the rings of Saturn. He also was able to prove that the earth rotates around the sun. Even though this was a time of learning this theory directly attacked Christianity. This made him into the enemy of the church, meaning that much of his life's works were hampered by the church fighting against his claims. This would be a problem to many scientist during the Renaissance and to the scientist in the following centuries.
Galileo came up with the basic principle of relativity, the laws of physics are the same in for anything that is moving at a constant speed in a straight line, no matter its speed or direction. Therefor there is no absolute motion or complete stop. This provided the basic framework for Newton's laws of motion and is central to Einstein's theory of relativity.
While Galileo's theories and inventions don't directly affect us today many of his theories helped influence the scientists that followed him.
His major contributions to science include his improved telescope from the original design which allowed him to see craters on the moon and the rings of Saturn. He also was able to prove that the earth rotates around the sun. Even though this was a time of learning this theory directly attacked Christianity. This made him into the enemy of the church, meaning that much of his life's works were hampered by the church fighting against his claims. This would be a problem to many scientist during the Renaissance and to the scientist in the following centuries.
Galileo came up with the basic principle of relativity, the laws of physics are the same in for anything that is moving at a constant speed in a straight line, no matter its speed or direction. Therefor there is no absolute motion or complete stop. This provided the basic framework for Newton's laws of motion and is central to Einstein's theory of relativity.
While Galileo's theories and inventions don't directly affect us today many of his theories helped influence the scientists that followed him.
Journal for physics lessons done by Yarrow Bedwin
Lesson One
I learned about the origins of physics, and how people of ancient Greece set the base of physics for future generations to iron out the kinks. Even if they had some theories wrong like how the world is only made of a certain amount of elements, they still started the ball rolling, Later people like Galileo would work of those theories and find out the theories closer to what we follow today. It also takes about the scientific method which is the set of steps you go through when conducting an experiment to make it repeatable.
Lesson two
This lesson is how to do scientific notation. Including how to add, subtract, multiply and divide. And also how to convert a number into scientific notation. It also included how to round numbers properly, i.e. how many significant digits are there.
Lesson three
This was the unit on how to convert units to there units, whether it be from feet to meters of mm to km. This unit teaches you how to do that and how to properly write in down so that it is easily figured out and is not likely to lead to mistakes.
Lesson four
This is the introduction into basic vectors, and it covers all the basics that you need two know, like how to draw them, how to find the value of a vector and how to add them together if possible.
Lesson five
This shows us another way to solve for vectors using Pythagoras.
Lesson six
This is about relative velocity, how objects affected when moving in a straight line and then having a force pushing against it. Unlike 4 and 5 which have questions like, a car went south for 5 km for 2 min and the west for 12 km for 4 min what was the cars total velocity. In lesson 6 we are introduced to questions like, a plane is flying at 105 km per hour. but there's a cross wind of 15 km per hour at E 20 S if they want to reach at town that is 550 N 70 W, what does there velocity have to be.
Lesson seven
Lesson seven is a little bit of a step back to basics, it goes through everything you need to know about displacement, and whats the difference between distance and displacement. It also covers how to derive displacement from graphs.
Lesson eight
This is just the basics on velocity, how to calculate it and how to find the average etc...
Lesson nine
This is the more in depth parts of velocity, like how to calculate instantaneous velocity and how to use a velocity time graph and how to find acceleration from a velocity time graph.
Lesson ten
It's an introduction to acceleration and kinematics, pretty much just how you use certain values to calculate other values centered around acceleration questions. You use 4 equations.
Lesson eleven
This unit is all about how to calculate the values of an object falling, meaning that you use 4 equations to solve for the value that you require, it includes a given value, gravity. Meaning that you can solve for anything with only 2 values.
I learned about the origins of physics, and how people of ancient Greece set the base of physics for future generations to iron out the kinks. Even if they had some theories wrong like how the world is only made of a certain amount of elements, they still started the ball rolling, Later people like Galileo would work of those theories and find out the theories closer to what we follow today. It also takes about the scientific method which is the set of steps you go through when conducting an experiment to make it repeatable.
Lesson two
This lesson is how to do scientific notation. Including how to add, subtract, multiply and divide. And also how to convert a number into scientific notation. It also included how to round numbers properly, i.e. how many significant digits are there.
Lesson three
This was the unit on how to convert units to there units, whether it be from feet to meters of mm to km. This unit teaches you how to do that and how to properly write in down so that it is easily figured out and is not likely to lead to mistakes.
Lesson four
This is the introduction into basic vectors, and it covers all the basics that you need two know, like how to draw them, how to find the value of a vector and how to add them together if possible.
Lesson five
This shows us another way to solve for vectors using Pythagoras.
Lesson six
This is about relative velocity, how objects affected when moving in a straight line and then having a force pushing against it. Unlike 4 and 5 which have questions like, a car went south for 5 km for 2 min and the west for 12 km for 4 min what was the cars total velocity. In lesson 6 we are introduced to questions like, a plane is flying at 105 km per hour. but there's a cross wind of 15 km per hour at E 20 S if they want to reach at town that is 550 N 70 W, what does there velocity have to be.
Lesson seven
Lesson seven is a little bit of a step back to basics, it goes through everything you need to know about displacement, and whats the difference between distance and displacement. It also covers how to derive displacement from graphs.
Lesson eight
This is just the basics on velocity, how to calculate it and how to find the average etc...
Lesson nine
This is the more in depth parts of velocity, like how to calculate instantaneous velocity and how to use a velocity time graph and how to find acceleration from a velocity time graph.
Lesson ten
It's an introduction to acceleration and kinematics, pretty much just how you use certain values to calculate other values centered around acceleration questions. You use 4 equations.
Lesson eleven
This unit is all about how to calculate the values of an object falling, meaning that you use 4 equations to solve for the value that you require, it includes a given value, gravity. Meaning that you can solve for anything with only 2 values.
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