Projectilemotion. Freebodydiagrams. Moment of inertia. Since the moment of inertia of an ordinary object involves a continuous distribution of mass at a continually varying distance from any rotation axis, the calculation of moments of inertia generally involves calculus, the discipline of mathematics which can handle such continuous variables. Since the moment of inertia of a point mass is defined by then the moment of inertia contribution by an infinitesmal mass element dm has the same form. This kind of mass element is called a differential element of mass and its moment of inertia is given by Note that the differential element of moment of inertia dI must always be defined with respect to a specific rotation axis.
The sum over all these mass elements is called an integral over the mass. Usually, the mass element dm will be expressed in terms of the geometry of the object, so that the integration can be carried out over the object as a whole (for example, over a long uniform rod). Roller Coaster. Welcome to the death defying Funderstanding Roller Coaster! This simulator is designed for people who want to design their own thrilling coaster and educators who want to use a cool activity to simulate the application of physics by using an exciting interactive tool and access to a wonderful reference source. It is your mission to become a roller coaster designer so that you can achieve maximum thrills and chills without crashing or flying off the track (unless that’s how you like your coaster to work!). If you accept this mission you must decide on a number of factors. You are responsible for setting the controls for the height of hill #1, hill #2, the size of the loop, the initial speed of the coaster, its mass, the gravity at work and the amount of friction on the track.
This great educational online tool offers an interactive way for kids to play a roller coaster game, and learn while doing it. Finally, some fun online education kids! If you need help, click on the ‘? Quot;How CDs Work" The CD player has the job of finding and reading the data stored as bumps on the CD. Considering how small the bumps are, the CD player is an exceptionally precise piece of equipment. The drive consists of three fundamental components: A drive motor spins the disc. This drive motor is precisely controlled to rotate between 200 and 500 rpm depending on which track is being read.A laser and a lens system focus in on and read the bumps.A tracking mechanism moves the laser assembly so that the laser's beam can follow the spiral track.
The tracking system has to be able to move the laser at micron resolutions. JK's Applets for Teaching Astrophysics. The period of a satellite. The period of a satellite Added by David Fairhurst on Feb 6, 2008 An interactive animation showing a satellite orbiting the Earth. Move the slider to change the height of the satellite's orbit and observe the effect this has on the period of the orbit. This resource is from the unit Satellites and Orbits which is part of Absorb Physics. The full Absorb Physics course normally sells for £400 - but you can get it free for your school! All you need to do is ask your colleagues in the maths department to try our new Sumdog games...
Terminal velocity of a skydiver. Terminal velocity of a skydiver Added by David Fairhurst on Feb 6, 2008 An interactive animation illustrating the terminal velocity of a skydiver. Terminal velocity is reached when the downward force of gravity is balanced by the upward force due to air resistance. Click the arrow button to reveal the forces acting on the skydiver. Click the arrow button again to reset the animation. This resource is from the unit Friction which is part of Absorb Physics. The full Absorb Physics course normally sells for £400 - but you can get it free for your school! All you need to do is ask your colleagues in the maths department to try our new Sumdog games...
Mass of the Earth. Topic index | author index | special index As we all learned in grade school, the Earth is the third planet from the Sun. The planet Earth is only a tiny part of the universe, but it is the home of human beings and all known life in it. Animals, plants and other organisms live almost everywhere on Earth's surface. It ranks fifth in size, and its mass is found to be about 5.98 × 1024 kg. Mass is a characteristic that is inherent, and it is independent of the object's environment and the method used to measure it. It is a scalar quantity, that is, a single value with and appropriate unit that has no direction.
The mass of the Earth may be determined using Newton's law of gravitation. F = Gm1m2/r2 = ma Gm/r2 = g m = gr2/G m = (9.8 m/s2)(6.37 × 106 m)2/(6.673 × 10-11 Nm2/kg2) m = 5.96 × 1024 kg The Earth gains mass each day, as a result of incoming debris from space. Samantha Dong -- 2002 Earth, the third planet from the sun, is one of the most unique celestial bodies in our solar system. F = ma.