# Physics

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The flashcards below were created by user phoenixbird56 on FreezingBlue Flashcards.

1. What did Galileo find in his experiment on the Leaning Tower of Pisa?
Mass does not matter (mass does not affect the amount of time it takes for an object to hit the ground.)
2. Inertia
the property of a moving object to continue moving (if object has inertia it will continue moving forever)
3. Velocity
measure of both speed AND direction
4. Acceleration
the rate of change in velocity
5. formula for acceleration
a=(change in) v/(change in) t
6. formula for velocity in free fall
v=gt
7. formula for velocity on a surface (horizontal)
v=(change in) d/(change in) t
8. acceleration in free fall (on earth)
10m/s2 (ignoring air resistance/friction) (technically 9.8 m/s2 with air resistance/friction)
9. free fall
occurs when an object is free of all restraints and falls under the influence of gravity alone
10. distance formula
d=1/2 g t2
11. formula for work
W=Fd
12. formula for power
P=W/t (units:watts)
13. pathagorean theorem formula for resultant vector
a2+b2=R2
14. vector
any quantity that requires both magnitude ( value) and direction
15. scalar
a quantity that can be described by magnitude alone
16. projectile
any object that is projected by some means and continues in motion under the influence (something you throw once it is out of you hand)
17. Trajectory
the path a projectile takes
18. which angle will go the farthest if you project something at that angle?
45o
19. tangential speed
speed of something moving in a circular path
20. rotational speed
refers to the number of rotations per unit time
21. Newton's 1st Law of Motion
evey object continues in its state of rest or in uniform motion in a straight line unless it is compelled to change that state by forces impressed upon it (objects in motion stay in motion, objects at rest stay at rest unless acted upon by an outside force)
22. Newton's 2nd Law of Motion
The acceleration of an object is directly proportional to the net force acting on the object, is in the direction of the net force, and is inversely proportional to the mass of the object. (a~F, 1/2a=2xm)
23. Newton's 3rd Law of Motion
Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first. (for every action there is an equal and opposite reaction)
24. Force fomula (2nd law)
F=ma
25. acceleration formula(2nd law)
a=F/m
26. Potential energy formula
PE=mgh
27. Kinetic Energy formula
KE=1/2 m v2
28. efficiency formula
efficiency=useful energy out/total energy in (%)
29. Fulcrum problems fomula
Fd(in)=Fd(out)

### Card Set Information

 Author: phoenixbird56 ID: 113761 Filename: Physics Updated: 2011-11-01 22:37:18 Tags: physics test thursday newton energy work power vector mechanics linear nonlinear motion machines efficiency more Folders: Description: huge test thursday :) Show Answers:

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