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Force

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  • what is the unit of Weight...?
    kgf
  • The eraser gets smaller and smaller as you use it more and more. Explain
    Friction causes wear and tear.
  • Modern cars have a special steamlined body in order to :
    Reduce friction.
  • Force is expressed by stating both _____ and ________
    Magnitude and direction.
  • Arrange the following in decending order. rolling friction static friction sliding friction
    Static > sliding > rolling
  • Define rolling friction.
    The frictional force required to roll a body on a surface is called the rolling friction
  • List three ways of reducing friction.
    By making the surfaces smooth. By the use of lubricants. By steamlining.
  • If we rub our palm they become warm. Explain..
    Friction produces heat.
  • Friction is always disadvantages. Whether the statement is true or false.
    False.
  • Two forces acting in opposite directions, each with a force of 20 N. What is the resultant force __________.
    0 N
  • Mass is measured by the _______ balance where as weight is measured by _______ balance.
    Physical, Spring
  • The standard Unit of force is __________
    Newton
  • Give one example each of a force as : a)Stretch. b)Squeeze.
    a) Rubber band b) gum tube.
  • A body changes its position with time with respect to its surrounding is said to be in ____ .
    State of Motion
  • Two horses pull the cart in the same direction, each by a force of 50N. The net force on the cart is ___ N.
    100N
  • What is streamlining...?
    The process of giving shape with pointed ends is called streamlining.
  • What is the cause of friction .
    Interlocking of the irregular projections on the two surfaces in contact..
  • A force does not change ____
    Mass
  • State two disadvantages of friction.
    Friction causes wear and tear. Friction produces heat.
  • It is difficult to walk on wet road. Explain.
    When road becomes wet, friction is reduced and hence the road becomes slippery.
  • Identify as push or pull : a) Drawing a bucket of water from a well. b) A football player taking a penalty kick.
    Pull and push.
  • Define Force
    Force is a cause which changes the state of a body or changes the size or shape of the body.
  • On pulling a string, its __________ increases.
    length
  • Friction _________ motion
    Opposes
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