The force that causes the acceleration and keeps the body moving along the circular path is
called centripetal force. The direction of this force acts towards the centre. Newton concluded that
the motion of the moon around the earth is due to centripetal force. This force is provided by the
gravitational pull of the earth Similarly, in our solar system all the planets move around the sun due
to the centripetal force provided by the force of attraction of the sun. The centripetal force depends
on the mass and speed of the object, and the radius of the circular path. If there were no such force,
an object moving along the circular path would fly off along a straight line with uniform speed. This
straight line is a tangent at a point on the circular path
1)What is the reason for the motion of the moon around the earth?What will happen to a body moving along the circular path in the absence of centripetal
force?
(a) It will move faster along the circular path. (b) It will go along a straight line.
(c) It will stop moving
(d) It will move slower along the circular path
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Answer: b it will go along a straight line
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