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Chapter 4 Force and Motion - Test 4
1.
A lead shot of mass 5 g is fired with an air gun. If the velocity of the shot is 60 ms
-1
its momentum is ______________
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2.
Rocket or Jet engine works on the Principle of ___________
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3.
When a body starts moving on the surface of another body then an opposite force comes into play and ______________ its motions
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4.
Energy is ______ to overcome the resistance against motion.
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5.
The nails used to join pieces of wood etc. stay there only due to _________
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6.
When a body moves with the help of wheels the friction in this case is known as ______
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7.
The maximum value of static friction 'fs (max)' is also known as ___________
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8.
The limiting friction also increases with an _____ in the normal force.
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9.
The value of co-efficient of static friction depends on the nature and ______ of the surfaces sliding against each other.
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10.
μ
s
or μ
k
is the ratio of forces, therefore they have _______ unit.
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11.
The rolling friction is about _____ times smaller than the sliding friction.
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12.
The parts, which slide against one another, are highly polished. This ____ the friction.
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13.
Rate of change of change of momentum of body is equal to the applied _____ on it.
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