posted by Elena
1. True or False: If the net force of an object is 0 N, the forces are considered unbalanced. (True)
2. Which of the following forces causes a feather to fall slower than a blowing ball?
3. A small fish in the pacific ocean watches a shark swim by a large rock a few meters away. Which of the following reference point in this scenario?
large rock ←
4. Which of the following pairs of objects would have the strongest gravitational pull?
two buildings in the same city ←
two tall buildings in different cities
two stars very far away from each other
two stars very close to each other
5. A maglev train uses powerful magnets to lift the train above the tracks as it moves forward. Such as a design reduces which of the following forces?
air resistance ←
6. Which of the following examples does not demonstrate a change in velocity?
An elevator slows down in order to stop at the top floor ←
A cruise ship travels west at a constant speed
A soccer ball is passed across the field or ←
A train remains at a constant speed as it moves around the bend
7. Which of the following does not need to be measured in order to describe motion?
size of an object
distance the object traveled
velocity of the object ←
acceleration of the object
Thanks so much!
1. Nope. If the net forces are zero, it means that the object is at an equilibrium state (may be static of dynamic), and thus implies the forces cancel or balance each other out.
2. It's actually air resistance. I suggest you read about Aristotle's and Galileo's experiment about the topic (gravity).
3. Ain't sure with this one. ^^;
4. Recall that gravitational force can be measure using the formula:
F = G*m1*m2 / r^2
where m1 and m2 are the masses of the objects, and r is the distance between them.
Thus, F is largest when the objects are very massive, and they are close with each other. And therefore, it's "two stars very close to each other".
5. I think it's the rolling friction, because there would be less contact between the tracks and the wheels of the train.
6. It's "a cruise ship travels west at a constant speed". Note in order to have a constant velocity, you must have both magnitude and direction as constant.
7. It's the size of the object. Note that distance, velocity and acceleration are the essential concepts of kinematics.
Hope this helps~ :3
Um. you should stop saying "I think" because your not sure and what if "Elena" doesn't get the grade on her science quiz that she wants.
If anybody is still looking for the answers to this quiz, I got a 100 with these answers:
On number 9, give an example in change of velocity. The change of velocity is known as acceleration, and it is the rate at which velocity changes. The change can be speed, direction, or both. So if you were driving at 50 mph and sped up to 55, you would be accelerating 5 miles per hour. Get it?
That is all I know! sorry! hope these are useful!
Anon is 100% correct
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Anon got 6 wrong, its supposed to be A. Rolling Friction
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