Q. 153.8( 5 Votes )

Fill in the following blanks with suitable words:

(a) To every action, there is an ………. and ……..reaction.

(b) Momentum is a ……..quantity. Its unit is …………….

(c) Newton’s second law of motion can be written as Force = mass × …………… or Force = …………….. or change of …………

(d) Forces in a Newton’s third law pair have equal …………… but act in opposite …………

(e) In collisions and explosions, the total ………… remains constant, provided that no external ………… acts.

Answer :

(a) equal; opposite (As per Newton’s third law)

(b) Vector; kg m/s (As momentum is the product of mass and velocity and velocity is a vector quantity)


(c) Acceleration; rate; momentum


(d) Magnitude; directions (Conservation of momentum)


(e) Momentum; force; (Explained in conservation of momentum)


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