Laws Of Motion

Physics
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Which of the following statements is/are correct for internal forces?

A
They are always balanced
B
They are never balanced
C
They may or may not be balanced
D
none of these
Easy
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Which of following Newton's laws reveals the underlying symmetry in the forces that occur in nature?

A
First law
B
Second law
C
Third law
D
Law of gravitation
Easy
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When a moving body is suddenly stopped, then:

A
Frictional force increases.
B
Friction force remains same as it was while the car was moving.
C
Friction force reduces but has a non zero value.
D
Frictional force reduces to zero as it is a self adjusting force.
Easy
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A stone tied to a string is rotated in a vertical circle. The minimum speed with which the stone has to be rotated in order to complete the circle :

A
decreases with increasing the mass of the stone
B
is independent of the mass of the stone
C
decreases with increasing the length of the string
D
is independent of the length of the string
Easy
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When a body is in equilibrium, which of the following must be true ?

A
There is no force acting on it.
B
The sum of all the forces acting on it must be zero.
C
The sum of all the forces acting on it is not equal to zero.
D
There are exactly two forces acting on the body.
Easy
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Impulse is equal to

A
momentum
B
change in momentum
C
rate of change of momentum
D
rate of change of force
Easy
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Action and reaction

A
always act on two different bodies
B
are equal in magnitude
C
act in opposite directions
D
All the above
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In which of the following cases the net force is not equal to zero?

A
A kite skillfully held stationary in the sky.
B
A ball falling freely from a height.
C
A helicopter hovering above the ground.
D
A cork floating on the surface of water.
Easy
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