# Physics Test 2

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1. equilibrium
experiencing zero net force
2. equilibrium position
When nothing is pushing or pulling on the spring, and the free end is in equilibrium at a particular position
3. stable equilibrium
the end of the spring when it naturally returns to its equilibrium position if it is stretched or compressed
4. Hooke's law
• The stiffer the spring and the farther you stretch it, the harder it pulls back
• F = -kx
• restoring force = -spring constant x distortion
5. spring constant
k, measure of the spring's stiffness
6. collision energy
kinetic energy absorbed during the collision
7. rebound energy
kinetic energy released during the rebound
8. coefficient of restitution
coefficient of restitution = rebound speed of ball / collision speed of the ball
9. vibrational node
points near each end of the bat that do not move when the bat vibrates
10. elastic collisions
bounces so perfect that all of the collision energy is stored and returned as rebound energy
11. inelastic collisions
collisions that fail to return some of the collision energy as rebound energy
12. centripetal acceleration
• "center-seeking"
• brings toward the center
13. Nicolaus Copernicus
• 1473-1543
• Heliocentric theory
• start of modern astronomy
• delayed publication of his book till the year of his death
14. Galileo Galilei
• 1564-1642
• championed heliocentric universe by observation
• telescope observations
15. Johannes Kepler
• laws of planetary motion
• used data of Tyco Brahe as postulate motion of planets
16. Kepler's laws
• 1. planet orbits = ellipses
• 2. area swept fro the sun to a planet is constant in time (conservation of angular momentum, speeds up closer to foci)
• 3. the bigger the orbit, the longer it takes the planet to go around its orbit
17. geosynchronous orbit
• at 35,900km above the earth's surface
• orbits the earth every 24 hours, stays at same place above the earth
 Author: Anonymous ID: 239961 Card Set: Physics Test 2 Updated: 2013-10-10 22:01:48 Tags: physics Folders: Description: Physics Test 2 Show Answers: