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Force and Pressure Test - 25

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Force and Pressure Test - 25
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  • Question 1
    1 / -0
    Which of the following is not an example of muscular force?
    Solution
    An apple falling from a tree is an example of gravitational force. 
    An animal pulling a cart, a man pushing a stationary car and two girls pushing each other are examples of muscular force because force which is exerted by muscles of the body is called Muscular force.
  • Question 2
    1 / -0
    Which of the following is a non-contact force?
    Solution
    It is not necessary for the two objects to be in contact (touch) with each other to exert gravitation force, magnetic force and electric force. These three forces can be exerted even if the two objects are separated by a finite distance. Thus these forces are non-contact forces.
  • Question 3
    1 / -0
    In tug of war, if the two teams have equal strength then:
    Solution
    The rope breaks only if the force applied by both the teams is very large. It has nothing to do with the equality of the strength in the teams on the two sides of the rope.
    In a tug of war, if the two teams are applying equal force on the rope then the net force acting on the rope is zero and hence the rope stays at the same place.
  • Question 4
    1 / -0
    If the forces on an object are balanced, then the net force is:
    Solution
    If the forces on the object are balanced, this means that the individual force cancel out each other resulting in a zero net force acting on the object.
  • Question 5
    1 / -0
    A number of forces act on a body at the same point and the body does not move. What do you conclude from this?
    Solution
    Balanced forces cancel out the effect of each other. Thus, no net external force acts on the body and hence a body at rest does not move.
  • Question 6
    1 / -0
    Magnetic force is a non contact force because, for magnetic force to apply,
    Solution
    Magnetic force, electric force and gravitational forces are non contact forces because for these forces to apply, the bodies need not be in contact (physically touch) with each other.
  • Question 7
    1 / -0
    Which of the following is not a contact force?
    Solution
    • Tension force applied by a rope on a body needs physical contact to pull the body.
    • Normal force acts between two surfaces in contact. If two surfaces are not in contact, they can't exert a normal force on each other.
    • Air resistance is the force in opposition to the relative motion of an object as it passes through the air. Here also, the air particles in contact with the surface of the object rub against it to slow it down.

    All these forces are called as contact forces.

    Hence, option D is correct.
  • Question 8
    1 / -0
    In a tug of war, there are two teams - A and B. A applies 200 N200\ N force and B applies 1000 N1000\ N force in the opposite direction. Choose the correct statement(s).
    Solution
    Force applied by team A:        FA=200 NF_A = 200\ N           (towards A)
    Force applied by team B:        FB=1000 NF_B = 1000\ N         (towards B)

    Net force, Fnet=FBFA=1000200 =800 NF_{net} = F_B-F_A = 1000-200  =800\ N        (towards B)
    So, the force applied by team-B is more and hence the rope will be drawn towards B.

  • Question 9
    1 / -0
    In order to apply a force on the body:
    Solution
    Two bodies must  interact in order to apply a force.
    Whenever we see a force acting we see actually two bodies exerting force on each other. As per third law forces apply in pairs always.
    So actually whenever we note a force there are actually two forces and two bodies interacting mutually.


  • Question 10
    1 / -0
    A set of unequal and opposite forces is called:
    Solution
    Unequal and opposite forces do not cancel out each other completely and thus resulting in net force acting in a particular direction. A set of such forces is called a set of unbalanced forces.
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