Projectiles,SATELLITES in addition to Orbit Projectile Defined Horizontal Motion Associated with a Projectile Vertical Motion Associated with a Projectile Projectile Motion Review
Ames, Steve, Faculty Advisor has reference to this Academic Journal, PHwiki organized this Journal Projectiles,SATELLITES in addition to Orbit Satellite in addition to Circular Motion The path of an orbiting satellite follows the curvature of the Earth. Projectile Defined Any launched object that moves through air or space under the influence of gravity. Horizontal Motion Associated with a Projectile Objects launched horizontally continue in a horizontal direction a constant speed due to its inertia.
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Vertical Motion Associated with a Projectile Objects motion is accelerated due to the as long as ce of gravity (free falling!!) Projectile Motion Review How would you describe the downward motion of the two balls
What is an Earth Satellite A projectile that circles the Earth due to gravitational as long as ce. Orbit occurs because the object moves fast enough to fall continuously towards the Earth in addition to miss it. Horizontal vs. Vertical Motion as long as Satellites gravity There is a balance between the tangential speed of the projectile in addition to the as long as ce of gravity acting on the projectile tangential velocity (or rotational velocity) Note the curved projectile path! Projectile Path Principles The greater the objects horizontal motion (or speed), the wider the arc of its curved path. If thrown from the same height, both projectiles will l in addition to at the same time even if their horizontal speeds are different. See Figures 14.1 in addition to 14.3 on page 263.
Figure 4 1) Label the arrows as gravity or sideways velocity. Place term inside box. Which arrow represents centripetal as long as ce 3) What would happen to the moon if the Earths gravity suddenly disappeared a b Horizontal vs. Vertical Motion gravity There is a balance between the orbital velocity of the projectile in addition to the as long as ce of gravity pulling on the projectile (as the projectile pulls on the Earth) Orbital velocity The Earth Curves A horizontal speed of 8 km/s will cause the projectile to become a satellite.
Circular Orbits A projectile with a speed of 8 km/s will orbit the Earth in a circle. A satellite in circular orbit is always moving perpendicular to gravity. Satellites Path The shape of the path of a satellite is circular or elliptical (oval). An ellipse is a closed oval-shaped path. The Earth orbits the Sun in an ellipse! Circular in addition to Elliptical Orbits The cause as long as a projectile to orbit the Earth is the horizontal speed of the projectile. Checking horizontal speed (tangential velocity) -Less than 8 km/s: no orbit -At 8 km/s: circular orbit develops -Greater than 8 km/s: elliptical orbit develops
Orbit A successful orbit occurs when the horizontal speed balances the downward acceleration of gravity. The unbalanced as long as ce caused by gravity provides the change in velocity needed to keep the satellite turning. Checking horizontal speed (tangential velocity) -Less than 8 km/s: no orbit -At 8 km/s: circular orbit develops -Greater than 8 km/s: elliptical orbit develops -escape velocity at 11.2 km/s Escape Speed A vertical speed that is sufficient to ensure that the object will leave the Earth or whatever object from which the projectile is launched. CENTRIPETAL FORCE The as long as ce that keeps an object going in a circle (means toward center). Gravity, friction in addition to pulling on a cord are examples of centripetal as long as ce. You feel a push away from the center because of your inertia. It takes a as long as ce to change your momentum.
Centripetal Motion Applications http://www.glenbrook.k12.il.us/gbssci/phys/mmedia/circmot/cf.html http://www.glenbrook.k12.il.us/gbssci/phys/mmedia/vectors/sat.html http://sol.sci.uop.edu/~jfalward/physics17/chapter4/chapter4.html References http://www-istp.gsfc.nasa.gov/stargaze/Skeplaws.htm The Speed of Projectiles in addition to Satellites For projectiles in addition to satellites, the speed of the object is related to differences in the two components of motion.
Ames, Steve Faculty Advisor
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