Per NCERT §4.4, Newton's FIRST law states which of the following?
AZero net external force gives no acceleration
BForce is always required to maintain motion
CMomentum is always conserved in any frame
DAction and reaction are equal in magnitude
Answer & Solution
Correct answer: A. Zero net external force gives no acceleration
NCERT §4.4: F_net = 0 ⇒ a = 0. A body either stays at rest or moves uniformly in a straight line.
Related questions
A stone is whirled on a string. The inward force keeping it on its circle is the centripetA ring or sphere rolling without slipping touches the ground at just one point at a time. Experiments show that the coefficient for a sliding object compares with the one for a staThe constant of proportionality linking maximum static friction to the normal force is theThe friction acting before an object begins to slide is distinguished from the friction acA crate is pushed but does not budge. The surface force that cancels the push is called:A book lies still on a table. Balancing its weight is an upward push from the table calledTwo railway wagons collide and couple together. The standard application of conservation o