close

Privacy guaranteed - Your email is not shared with anyone.

formula for speed

Discussion in 'The Okie Corral' started by capnjim01, Feb 1, 2010.

  1. capnjim01

    capnjim01

    Messages:
    3,209
    Likes Received:
    1,016
    Joined:
    Apr 4, 2006
    Location:
    New Braunfels, Texas
    if you jump from an airpalne(why doesn't matter) and your speed of descent is 9.8m s/s. i think that means second per second what speed are you traveling.
     
    Last edited: Feb 1, 2010
  2. bluenoise

    bluenoise

    Messages:
    7,844
    Likes Received:
    0
    Joined:
    Nov 15, 2008
    Location:
    SF Blue Area, CA
    It means that, in the absence of air resistance or other factors that would interfere with your fall, you gain another 9.8 meters/second in speed for each second you are falling.

    After one second: 9.8 m/s
    After two seconds: 19.6 m/s
    After three seconds: 29.4 m/s

    and so on.
     

  3. capnjim01

    capnjim01

    Messages:
    3,209
    Likes Received:
    1,016
    Joined:
    Apr 4, 2006
    Location:
    New Braunfels, Texas
    ok that makes sense but in free fall how do you figure the speed.
     
  4. john58

    john58 BHO is a LIAR!

    Messages:
    7,813
    Likes Received:
    3
    Joined:
    Mar 15, 2009
    Location:
    Baton Rouge, La
  5. bluenoise

    bluenoise

    Messages:
    7,844
    Likes Received:
    0
    Joined:
    Nov 15, 2008
    Location:
    SF Blue Area, CA
    It depends on how long you've been falling. For each second you've been falling, you gained another 9.8 meters per second. If you have been falling 30 seconds, that's 30 * 9.8 or 294 meters per second.
     
  6. windplex

    windplex

    Messages:
    9,131
    Likes Received:
    9
    Joined:
    Aug 2, 2005
    Location:
    Milwaukee
    More complex and faster than you suspect: Time element is squared: one second then multiplier is 1, two seconds then multiplier is 4 three secs. multiplier is is 9 four secs. multiplier is 16 5 secs. is 25... 10 seconds multiplier is 100.. 30 seconds multiplier is 900...

    And there is a terminal velocity the differs for objects with differing shapes and denisities. the common mouse can survive a fall of any height since its terminal velocity is survivable.:

    Earth's gravity, denoted g, refers to the acceleration that the Earth imparts to objects on or near its surface. In SI units this acceleration is measured in m/s2 (metres per second per second, equivalently written as m·s−2 or N/kg). It has an approximate value of 9.81 m/s2, which means that, ignoring air resistance, the speed of an object falling freely near the Earth's surface increases by about 9.81 metres per second every second. This quantity is informally known as little g (contrasted with G, the gravitational constant, known as big G).

    There is a direct relationship between gravitational acceleration and the downwards weight force experienced by objects on Earth (see Conversion between weight and mass). However, other factors such as the rotation of the Earth also contribute to the net acceleration and are usually considered part of Earth's gravity.

    The precise strength of the Earth's gravity varies depending on location. The nominal "average" value at the Earth's surface, known as standard gravity is, by definition, 9.80665 m/s2 (32.1740 ft/s2). This quantity is denoted variously as gn, ge (though this sometimes means the normal equatorial value on Earth, 9.78033 m/s2), g0, gee, or simply g (which is also used for the variable local value). The symbol g should not be confused with g, the abbreviation for gram (which is not italicized).[1][2
     
    Last edited: Feb 1, 2010
  7. capnjim01

    capnjim01

    Messages:
    3,209
    Likes Received:
    1,016
    Joined:
    Apr 4, 2006
    Location:
    New Braunfels, Texas
    ok now I have headache. thanks guys for the help.
     
  8. Cinic

    Cinic Spongy Member

    Messages:
    1,978
    Likes Received:
    175
    Joined:
    Nov 17, 2001
    Location:
    Tempe, AZ
    I thought that the square was in the distance/displacement equation. d = 0.5*a*t^2

    The velocity equation is v = a*t.