Which one of the following is true, according to Newton’s laws of motion? Ignore

Question

Which one of the following is true, according to Newton’s laws of motion? Ignore friction.

a.)A sports utility vehicle (SUV) hits a stationary motorcycle. Since it is stationary, the motorcycle sustains a greater force than the SUV does.

b.)A semitrailer truck crashes all the way through a wall. Since the wall collapses, the wall sustains a greater force than the truck does.

c.)Sam (18 years old) and his sister (9 years old) go ice skating. They push off against each other and fly apart. Sam flies off with the greater acceleration.

d.)Two astronauts on a space walk are throwing a ball back and forth between each other. In this game of catch the distance between them remains constant.

e.)None of the these is true, according to the third law.

Explanation / Answer

options A and B are false because it does not matter whether the bodies are at rest or in motion the force applied on an object gets acted upon by force of equal magnitude but opposite direction as per 3rd law of motion.

Answer c is false, because according to the third law, Sam and his sister experience forces of equal magnitudes during the pushing activity. and Sam flying with smaller acceleration is based on second law as he has greater mass.

Answer d is false, because catching and throwing the ball is a result of astronaut applying a force to it, and, according to the third law, the ball applies an oppositely directed force of equal magnitude to each astronaut. These reaction forces accelerate the astronauts away from each other, so the distance between them will increase.

hence option e is correct that none of these is true according to newtons third law.

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