- #1
gazeem
- 9
- 2
- Homework Statement
- Which of the following statements describes what must be true in the context of Newton’s First Law?
A) The tendency for drivers to keep moving linearly while the car makes a sharp turn on the road is an example of the concept of inertia.
B) An object with zero acceleration and an object traveling at a constant acceleration are considered similar states.
C) Mass is a measure of an object’s ability to resist motion or movement of any kind.
D) The object is difficult to bring to a complete stop due to its high initial speed.
- Relevant Equations
- F = ma
I know what the answer is supposed to be, but I don't understand why. Here is my logic as to why I thought a few of these suggestions should be the right answer.
"C) Mass is a measure of an object’s ability to resist motion or movement of any kind."
Considering F = ma, and that mass is basically the multiplier of how much force we'll need to apply to an object to get an acceleration of x, I would presume that mass *is* a measure of inertia, because the greater the mass, the more force you need to get an object to move at a particular acceleration.
(Is my logic in this true? Perhaps the reason this answer is incorrect is because this is more so related to Newton's Second Law)
"D) The object is difficult to bring to a complete stop due to its high initial speed."
If two bowling balls of the same mass (let's say 2kg) are rolling down a frictionless lane and Ball #1 is at a constant velocity of 5m/s and Ball #2 is at a constant velocity of 10m/s, and we want to stop the bowling bowls by blowing a big fan in the opposite direction the bowling balls will travel, the force needed to stop Ball #1 in one second would be:
F = 2kg * (-5m/s^2) = 10N in the opposite direction that the ball is traveling,
and the force needed to stop Ball #2 in one second would be :
F = 2kg*(-10m/s^2) = 20N in the opposite direction that the ball is traveling.
Therefore, the object with the higher initial speed did require more force to bring to a complete stop.
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The correct answer is "A" and I have no idea as to why.
"C) Mass is a measure of an object’s ability to resist motion or movement of any kind."
Considering F = ma, and that mass is basically the multiplier of how much force we'll need to apply to an object to get an acceleration of x, I would presume that mass *is* a measure of inertia, because the greater the mass, the more force you need to get an object to move at a particular acceleration.
(Is my logic in this true? Perhaps the reason this answer is incorrect is because this is more so related to Newton's Second Law)
"D) The object is difficult to bring to a complete stop due to its high initial speed."
If two bowling balls of the same mass (let's say 2kg) are rolling down a frictionless lane and Ball #1 is at a constant velocity of 5m/s and Ball #2 is at a constant velocity of 10m/s, and we want to stop the bowling bowls by blowing a big fan in the opposite direction the bowling balls will travel, the force needed to stop Ball #1 in one second would be:
F = 2kg * (-5m/s^2) = 10N in the opposite direction that the ball is traveling,
and the force needed to stop Ball #2 in one second would be :
F = 2kg*(-10m/s^2) = 20N in the opposite direction that the ball is traveling.
Therefore, the object with the higher initial speed did require more force to bring to a complete stop.
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The correct answer is "A" and I have no idea as to why.