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Class 11
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Physics
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Laws of Motion
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Easy Questions
Laws Of Motion
Physics
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Easy Qs
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Hard Qs
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The combined effect of mass and velocity is taken into account by a physical quantity called:
A
Moment of momentum
B
Moment of force
C
Momentum
D
None of these
Easy
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>
A ball of mass 'm' moves normal to a wall with a velocity 'u' and rebounds with a velocity 'v'. The change in momentum of the ball is (surface of the wall is smooth):
A
m
(
u
+
v
)
towards the wall
B
m
(
u
−
v
)
towards the wall
C
m
(
u
+
v
)
away from the wall
D
m
(
u
−
v
)
away from the wall
Easy
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When an athlete takes part in a long jump he runs for a while and then jumps. This is because:
A
inertia of motion helps him to take a longer jump.
B
running for a time makes him alert.
C
it helps him to focus on the point of jump.
D
he can apply more force for the jump after running.
Easy
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Statement A: If the force varies with time then the net force is measured by the total change in momentum of the body.
Statement B: Change in momentum and impulsive force are numerically equal.
A
A & B are correct
B
A & B are wrong
C
A is correct and B is wrong
D
A is wrong and B is correct
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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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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Assertion
When a bus starts suddenly, a person standing in it falls backwards.
Reason
It is due to inertia of rest.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
C
Assertion is correct but Reason is incorrect
D
Assertion is incorrect but Reason is correct
Easy
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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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>