26.
Increasing the time interval means the amount of force needed will decrease.
27.
Assuming everything about the object remains constant, it will require 5x more force to stop the object in 5 seconds compared to stopping it in
25 seconds.
28.
1080 N
29.
The stick formula combines the final momentum aspect of the O.G. formula. Because the two objects stick together and move off as one, we
can add their masses and multiply by a common final velocity. Moving as one object tells us they MUST be moving at the same rate of speed.
The explosive formula is a combination of the initial momentum aspect of the O.G. formula. Whatever is in the question, they start as one
object moving at a common rate of speed, thus why we add the masses and multiply by a common velocity for the initial conditions.
30.
Direction matters because momentum is a vector. Momentum is a vector because velocity is a vector. An object travelling left behaves
differently and will have different future interactions than an object moving to the right.
31.
484 N

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- Spring '13
- Cornelis(“Kees”)J.Uiterwaal
- Acceleration, Force, Mass