5. Which one of the following is true, according to Newton’s laws of motion? Ign
ID: 1778061 • Letter: 5
Question
5. Which one of the following is true, according to Newton’s laws of motion? Ignore friction. I know it is E. I need to know why it is E
A sports utility vehicle (SUV) hits a stationary motorcycle. Since it is stationary, the motorcycle sustains a greater force than the SUV does.
A semitrailer truck crashes all the way through a wall. Since the wall collapses, the wall sustains a greater force than the truck does.
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.
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 above is true, according to the third law..
6. Which one of the following descriptions violates Newton’s first law of motion? I know it is A, I need to know why it is A.
a.A rabbit’s foot is hanging on a chain from the rearview mirror of a car. As the car accelerates, the rabbit’s foot swings toward the windshield.
b.A glass of water is sitting on a table in the dining car of a train. The train brakes as it nears the station, and the glass slides forward.
c.A child is sitting in the back seat of a car and is not wearing a seat belt. The car is traveling forward, and the driver suddenly applies the brakes. The child flies forward against the rear side of the front seat.
d.A small suitcase is at the front of the overhead luggage compartment on an airplane. When the airplane begins its takeoff, the suitcase slides to the rear of the compartment.
Explanation / Answer
5.
As per Newton's 3rd law, force exerted by A on B must equal the force exerted by B on A. In view of this statement, the statement -
A sports utility vehicle (SUV) hits a stationary motorcycle. Since it is stationary, the motorcycle sustains a greater force than the SUV does - is wrong as forces must be equal.
A semitrailer truck crashes all the way through a wall. Since the wall collapses, the wall sustains a greater force than the truck does - is wrong as forces must be equal.
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 - is wrong as forces must be equal. Now as a = F/m so sam having greater value of m has smaller value of acceleration.
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 - is wrong as forces of reaction causes the accelerations and hence distance between them increases.
That's why none of them is correct.
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