Garnik+Khararjian

Physics

=__**The Tree Is Down**__=

In this picture, the tree is falling down, because of the rope that the workers put around it. The tree was originally at rest, which means that it was standing up straight. The tree would probably end up falling on the car. (Yikes)

1.Gravity= 9.8m/s^2 Gravity is in this picture above, because gravity is everywhere in the air. A free-falling object has an acceleration of 9.8 m/s/s, downward on Earth, but in this case, the tree isn't really free falling. I think this, because the tree is falling over from the top ebullient it down rather than falling from the sky. WIthout gravity, the tree would fall without any air resistance, because the tree is obviously outside, which definitely has some air resistance when an object is falling to the ground. 2.Acceleration= velocity/time The acceleration is involved in the tree picture, because the tree starts going faster as it goes down. The acceleration is at the influence of gravity. Without gravity, there really would't be any acceleration, because things would just fall at a constant speed and with no distractions. The acceleration is so important that it has a special name called acceleration of gravity which means the acceleration for any object moving under the sole influence of gravity

3.Energy, Kinetic Energy, and Potential Energy. KE = 1/2 mv2 GPE = mgh When the workers rapped the rope around the tree, the tree was at rest and as the rope was pulled to take the tree down, the potential energy of the tree was converted to kinetic energy, because it dropped. Knowing the energy of the tree allows us to figure out the potential and kinetic energies, its velocity, and its acceleration. The only thing we wouldn't know is the force, because we wouldn't know the speed. The faster an object moves, the harder air friction pushes on the object. Newton's third law then tells us that the object must also have to push back harder on the air. Since work is force times distance, the bigger the force, the more work is done.

Information: http://www.physicsclassroom.com/class/1dkin/u1l5b.cfm http://www.regentsprep.org/Regents/physics/phys02/falleng/default.htm Pictures: http://upload.wikimedia.org/wikipedia/commons/thumb/d/d1/GPB_circling_earth.jpg/300px-GPB_circling_earth.jpg http://mpd.me/.a/6a00e0098c5051883301053695fe5a970c-800wi http://zonalandeducation.com/mstm/physics/mechanics/forces/netForce/netf1.gif http://alum.mit.edu/pages/sliceofmit/files/2010/03/renewable-energy-in-tourism.jpg?w=300