The value of acceleration due to gravity
(a) is same on equator and poles
(b) is least on poles
(c) is least on equator
(d) increases from pole to equator
Two objects of different masses falling freely near the surface of moon would
(a) have same velocities at any instant
(b) have different accelerations
(c) experience forces of same magnitude
(d) undergo a change in their inertia
What is momentum? Write its SI unit. Interpret force in terms of momentum.
Represent the following graphically
(a) momentum versus velocity when mass is fixed.
(b) momentum versus mass when velocity is constant.
Water sprinkler used for grass lawns begins to rotate as soon as the water
is supplied. Explain the principle on which it works.
Two friends on roller-skates are standing 5 m apart facing each other. One
of them throws a ball of 2 kg towards the other, who catches it, How will
this activity affect the position of the two? Explain your answer
A truck of mass M is moved under a force F. If the truck is then loaded with
an object equal to the mass of the truck and the driving force is halved,
then how does the acceleration change?
Suppose a ball of mass m is thrown vertically upward with an initial speed v, its
speed decreases continuously till it becomes zero. Thereafter, the ball begins to
fall downward and attains the speed v again before striking the ground. It
implies that the magnitude of initial and final momentums of the ball are same.
Yet, it is not an example of conservation of momentum. Explain why ?
A horse continues to apply a force in order to move a cart with a constant speed. Explain why?
Two identical bullets are fired one by a light rifle and another by a heavy rifle with the same force. Which rifle will hurt the shoulder more and why?
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