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Physics net force homework help

  1. Jun 18, 2009 #1
    1
    The net force on any object in equilibrium is

    zero.
    10 meters per second squared.
    equal to its weight.
    None of these.

    End of Question 1


    Question 2

    2
    The tension in a rope that supports a 2-lb. bag of sugar hanging at rest is

    9 N.
    2 lbs.
    Either of these.
    Neither of these.

    End of Question 2


    Question 3

    3
    After a 100-lb. person steps on a bathroom scale and the reading is steady, the spring inside the scale is compressed with a force of

    less than 100 lbs.
    100 lbs.
    more than 100 lbs.

    End of Question 3


    Question 4

    4
    If a 100-lb. person steps on a pair of bathroom scales and leans so that the reading on one scale is 60 lbs., the reading on the other scale is

    also 60 lbs.
    40 lbs.
    less than 40 lbs.

    End of Question 4


    Question 5

    5
    Swing a rock overhead in a horizontal circle, and if the string breaks the rock will follow a

    straight-line path.
    spiral path.
    wider circle.
    same-size circular path.

    End of Question 5


    Question 6

    6
    If you have snow on your boots, you can get the snow off by stamping your boots on the floor. This is in accord with the law of

    equilibrium.
    tension.
    inertia.
    action and reaction.

    End of Question 6


    Question 7

    7
    If you exert a horizontal 100-N force on a crate and it slides along a factory floor at constant speed, then the friction between the crate and the floor is

    somewhat less than 100 N.
    100 N.
    somewhat more than 100 N.
    something that can't be known, but only guessed.

    End of Question 7


    Question 8

    8
    Hang by a rope and you put the rope in tension. Stand on a brick and you put the brick in

    tension also.
    compression.
    equilibrium.


    I just started a physics class so it would help me out if you could tell me if I answered these problems right. Any help would be great. Thanks a lot!!!

    1.Zero
    2.9N
    3.100lbs
    4.40 lbs
    5. straight line path
    6. inertia
    7. 100N
    8.compression
     
  2. jcsd
  3. Jun 18, 2009 #2

    Pengwuino

    User Avatar
    Gold Member

    #2 isn't correct. As you seem to know, pounds is a unit of force. If the force of gravity is 2lb, what must be the tension in order to keep the bag from falling? Also, convert pounds to newtons in order to see whether or not both answers are right.
     
  4. Jun 18, 2009 #3
    Pengwuino, is right. Check
     
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