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Forces and Laws of Motion Test - 32

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Forces and Laws of Motion Test - 32
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  • Question 1
    1 / -0
    The force needed for something to change movement or change direction is known as:
    Solution
    An unbalanced force acting on the object brings a change in the state and direction of the object. It is the cause of motion in the object.
  • Question 2
    1 / -0
    Which of the following is NOT an example of balanced force?
    Solution
    'See saw' moving up and down is due to the unbalanced force, as it tilts down in one side, it means that force acting on that side is more and opposite side is less. An unbalanced force brings change in the state of motion or in state of rest of object,it is the cause of motion in object.
    Box pushed from both direction with same force, so the  net force is zero. Hence no movement is seen here. In other case table is also steady that means forces are balanced.
  • Question 3
    1 / -0
    Inertia depends on which two factors:
    Solution
    Inertia depends on density and mass. Directly proportional to both of them.
  • Question 4
    1 / -0
    The strength of force is expressed by?
    Solution
    Force could be larger or smaller than the other.the strength of a force is usually expressed by its magnitude.
  • Question 5
    1 / -0
    When it is known that a net force is operating on an object, it is known that the object is:
    Solution
    Second law of motion gives , 
                              $$F=ma$$ ,       where $$F$$ is force and  $$m$$ is mass and $$a$$ is acceleration
     given that net force is operating on object , as the mass of object remains constant therefore it is being accelerated.
    And acceleration will be given by $$a=\dfrac{F}{m}$$
  • Question 6
    1 / -0
    An arm wrestling competition among a strong person and a weak one is an example of?
    Solution
    As both strong and weak person have different body weights and mass. A strong person can apply more force than a weak person. So this is an example of Unbalanced forces.  
  • Question 7
    1 / -0
    When two equal forces act on an object in opposite directions, they are known as:
    Solution
    Balanced forces are equal and opposite in direction, they act on the same body. The net force due to these forces is zero.
  • Question 8
    1 / -0
    Which of the following type of forces is responsible for keeping a cart at rest or maintaining it  moving at constant velocity?
    Solution
    A balanced set of force is one where all forces cancel out each other to give a zero resultant force.
    Such force would cause no acceleration and hence no change in velocity of object, and thus it would continue moving at constant velocity or it would be in rest.
  • Question 9
    1 / -0
    A girl holds an orange at rest in her hand. One force in an action/reaction pair is the force of earth's gravity pulling down on the orange.
    What is the other force in the action/reaction pair of forces?
    Solution

    Sir Newton's third law states that for every action there is an equal and opposite reaction, action and reaction act on different objects.
    When weight of orange (gravitational pull) acts on the hand vertically downward, the normal force on orange by hand acts pushing the orange upward.
  • Question 10
    1 / -0
    A goldfish swims through an aquarium by moving its fins and tail. What causes the fish to move forward?
    I. The force exerted by the water on the goldfish
    II. The force exerted by the tail of the goldfish on the water
    III. The force exerted by the fins of the goldfish  on the water
    Solution
    The fins and tail of goldfish exert force on the water in the backward direction and according to Newton's 3rd law of motion, the water exerts the same force on the goldfish in forward direction which helps it to swim in forward direction.
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