We introduce Hooke's law for elastic deformations. We consider forces between objects in contact and for convenience resolve them into their normal and frictional components — and as usual give you some problems to solve. In week 6 we explore work and energy, then power — the rate of doing work. We'll use work and Newton's second law to derive the quantity called kinetic energy. Looking at where work comes from, we'll distinguish two sorts of force — conservative and non-conservative.
That will allow us to introduce potential energy and mechanical energy. Power is the rate of doing work. We'll spend some time relating these quantities and their units to your everyday experience, relating Joules to kilowatt hours the unit used by electricity companies and kilowatts to horsepower and to human power.
Once we've defined momentum we'll use momentum to analyse elastic and inelastic collisions. Stand by for hammers, skateboards, car crashes and a bed of nails…. For as long as history — and probably much longer — people have stared at the planets and stars and wondered.
Why do they shine? What keeps them moving? Why don't they fall down? So next is gravity — and how it runs the solar system, the galaxy and the universe.
Escape speed, orbits, satellite manoeuvring, black holes: yes, all of the these. Great course. Good explanations and examples. The quizes and tests are not very easy sometimes, but they do you let think again. Very enjoyable! Just the course I was looking for a long time! This course is really great for aspiring physicists and engineers. This made me more interested in this this field and helped me in visualizing the inner workings of the universe.
Truly amazing for the students aspiring in the field of science and in the real-life application. And also for those who want to revise the concepts of physics. The course is very useful and is presented in a pleasant way so that we can understand the subject matter clearly and use them in solving real world problems. Access to lectures and assignments depends on your type of enrollment.
If you take a course in audit mode, you will be able to see most course materials for free. To access graded assignments and to earn a Certificate, you will need to purchase the Certificate experience, during or after your audit.
If you don't see the audit option:. When you purchase a Certificate you get access to all course materials, including graded assignments. Upon completing the course, your electronic Certificate will be added to your Accomplishments page - from there, you can print your Certificate or add it to your LinkedIn profile. If you only want to read and view the course content, you can audit the course for free.
Yes, Coursera provides financial aid to learners who cannot afford the fee. Apply for it by clicking on the Financial Aid link beneath the "Enroll" button on the left. Learn more. More questions? Visit the Learner Help Center. Physical Science and Engineering. Physics and Astronomy. Enroll for Free Starts Nov Offered By. About this Course 33, recent views. Flexible deadlines. Shareable Certificate. Beginner Level. Hours to complete. Available languages. Instructor rating.
Dr Elizabeth J. Offered by. He has written travel articles for several online publications and his travels have taken him all over the world, from Mexico to Latin America and across the Atlantic to Europe.
Two Different Systems Mechanics use mathematics all the time in their daily routine of repairing and modifying internal-combustion automobiles. How to Measure Electric Motor Torque. How to Calculate Piston Force. Meter Stick Vs. Yard Stick. Tecumseh Carburetor Identification. How to Calculate Gear Pitch. What Is the Dash on a Hydraulic Fitting? How to Calculate Hydraulic Cylinder Tonnage. How to Size a Pneumatic Cylinder. How Does a Pneumatic Cylinder Work?
Sprocket Ratio Calculations. Our next step is to construct a hypothesis. We, perhaps, hypothesize that there is no energy passing between the battery and the ignition system. This is a testable hypothesis that makes sense considering there was no sound made by turning the key. The null hypothesis would be that the battery connection has nothing to do with why the car does not start.
If we "do something" to the battery connector cables and the car starts we reject our null hypothesis and accept our alternative hypothesis that there was problem with the battery. We make the prediction that, if our null hypothesis is wrong, the car will start after "manipulating" the connectors. So, to test our hypothesis we conduct an experiment. An experiment is an action that manipulates our system enabling us to better understand how the system works.
A good experiment is designed to specifically test our null hypothesis. Our experiment, therefore, may be to hit the battery connectors with a hammer to jar loose the corrosion. We must always keep in mind our null hypothesis the connectors are not our problem! We smack the cable connectors - POW! We then get in the car and see if it will start. We interpret our result and conclude that our null hypothesis appears to be correct. We, therefore, tentatively accept that the battery connectors are not the problem.
That is an example of using the scientific method, a process we actually use in everyday activities to understand what is going on around us. Unfortunately, and not surprisingly, it is possible that our conclusions are wrong. This may occur due to a failure at any one of the steps of the process.
For instance, we may find out from a real auto mechanic that the connection of the cables to the battery were in fact the problem. It turns out that my example above is as very weak test of the hypothesis that our problem lies with the battery connectors. I, for example, did not replicate this experiment try it several times or line up a bunch of other similarly dead cars and wonk on their battery connectors , which always is a good thing to do in a manipulative experiment such as this I whacked the connectors.
Keep in mind that not all experiments are manipulative, however. Examples of these include the Yellowstone fires that burned some areas but not others or the "disturbance" caused by the volcanic eruption of Mount St. Science is "self correcting. It is possible to be wrong and have the right answer surface later we concluded the battery cables were not a problem when they were - smacking the cables was not a sufficient test of our hypothesis.
This is because we can get new data or we may change our inference about the data we had.
0コメント