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Laws Of Motion

Physics
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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.
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Maximum value of static friction is:

A
limiting friction
B
rolling friction
C
normal friction
D
coefficient of static friction
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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
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A certain particle undergoes erratic motion. At every point in its motion, the direction of the particle's momentum is always

A
the same as the direction of its velocity
B
the same as the direction of its acceleration
C
the same as the direction of its net force
D
the same as the direction of its kinetic energy
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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
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The quantity that best represents the motion of a rigid body is

A
its mass.
B
its speed.
C
its velocity.
D
its linear momentum.
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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.
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