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A ball is thrown upward. While the ball is in free fall, does its acceleration
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Increases
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Decreases
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Increases and then decreases
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Decreases and then increases
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Remain constant
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After a ball is thrown upward and is in the air, its speed in all path
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Increases
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Decreases
-
Increases and then decreases
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Decreases and then increases
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Remain the same
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If vector B is added to vector A, which two of the following choices must be true in order for the resultant vector to be equal to zero?
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A nd B are parallel in the same direction and have same magnitude
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A and B are parallel in opposite directions, but have same magnitude
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A and B have the same magnitude
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A and B are perpendicular but have same magnitude
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None of them is right
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A car moves along y-axes. In the figure, velocity of the car as a function of time is shown in three parts (I, II, III). Which statement is ALWAYS true?
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Velocity is constant in part II
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A car drives backward in part I
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Velocity is negative in part III
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Velocity is negative in part I
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Nothing is true
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What is the cross product of two vectors A and B, if the angle between them is 30 degree, and magnitudes are |A|=4, |B|=2
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5.6
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4
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0
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8
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2.5
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When a box rests on the floor, it is acted upon by the gravitational and the _________________ force.
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Centrifugal
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Acceleration
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Normal
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Inertia
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Friction
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Motion is produced by
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all forces
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unbalanced forces
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balanced forces
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the absence of force
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none of them
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Force is that agent which produces or tends to produce the __________.
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Speed in the body
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Acceleration in the body
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Constant velocity in the body
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Constant angular velocity in the body
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mass
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A force of 3N acts perpendicularly to a force of 4N. Their resultant has magnitude of ______
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1N
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5N
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7N
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9N
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25N
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In inelastic collision between the two bodies __________.
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Only momentum of the system is conserved
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Only the kinetic Energy of the system is conserved
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Both the kinetic Energy and Momentum of the system remain the same
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Total energy is not conserved
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Angular momentum is conserved
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Work done by a grass cutter is maximum when he pulls it __________.
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Making an angle 450 with the floor
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Making an angle 900 with the floor
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Along a line parallel to the floor
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Making an angle 600 with the floor
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Making an angle 550 with the floor
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A man does the work if he ___________.
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Goes to fifth floor of the building
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Goes to fifth floor of the building and comes back to ground floor
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Remain on the ground floor
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Goes to the basement and comes back to ground floor
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Goes to fourth floor of the building and comes back to ground floor
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In elastic collision between the two bodies __________.
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Only momentum of the system is conserved
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Only the kinetic Energy of the system is conserved
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Both the kinetic Energy and Momentum of the system remain the same
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Total energy is not conserved
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Angular momentum is conserved
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When the constant force and displacement are parallel to each other, then work is __________.
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Minimum
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Maximum
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None of these
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Depends on force magnitude
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Changes with time
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In rotational motion, the quantity, which plays the same role as the inertial mass in linear motion, is called ___________.