Question #1: If the net force on an object is 0 N, the forces are considered unbalanced.
a. true
b. false
I think that the answer is "b" since unbalanced forces causes objects to move and have like 5 N or so on.
Question #2: Most people in the United States use feet and miles to measure distance in their everyday lives. Why do scientists in the United States use meters to measure distance?
a. Meters allow scientists to be more accurate in their measurments
b. Science requires special measurements that are not used in everyday life
c. All scientists use meters to measure distance to help eliminate confusion
d. Meters are better than feet for measuring objects in motion
I think the answer is "c" since meter is a SI unit for distance that all scientists use to avoid confusion.
Question #3: Which of the following forces caused a feather to fall slower than a bowling ball?
a. gravity
b. rolling friction
c. sliding friction
d. air resistance
According to what I have studied the answer should be "d" because air resistance is the fluid friction experienced by objects moving through air.
Question #4: A small fish in the Pacific Ocean watches a shark swim by a large rock a few meters away. Which of the following is the reference point in this scenario?
a. shark
b. large rock
c. water
d. Pacific Ocean
According to what I have studied a reference points is the point that the motion of an object can be compared to. So I think the answer is "b".
Question #5: Which of the following pairs of objects would have the strongest gravitational pull?
a. two tall building in the same city
b. two tall buildings in different cities
c. two stars very far away from each other
d. two stars very close to each other
I think the answer is "d" because according to what I have studied stars have a strong gravitational pull so two stars together would have a big gravitational pull.
Question #6: A maglev train uses powerful magnets to lift the train above the tracks as it moved forward. Such a design reduces which of the following forces?
a. rolling friction
b. gravity
c. air resistance
d. fluid friction
I think the answer is "b" because gravity could make the train go down, but with those powerful magnets then it helps the train.
Question #7: Which of the following examples does NOT demonstrate a change in velocity?
a. An elevator slows down in order to stop at the top floor
b. A cruise ship travels west at a constant speed
c. A soccer ball is passed accross a field
d. A train remains at a constant speed as it moved around a bend
According to what I have studied the answer should be "b" because velocity is the speed and direction of moving objects. The cruise ship in answer "b" travels west at a constant speed and that does not demostrate a change in velocity.
Question #8: Which of the following does not need to be measured in order to describe motion?
a. size of object
b. distance the object traveled
c. velocity of the object
d. acceleration of the object
According to what I have studied in order to describe motion, scientists must be able to measure the distance, direction, and speed of a moving object. So I think the answer should be "a".
Thank You
-Gourami
bro you on pearson too i need all the right anwers but these guys keep on saying i think
Question #1: The correct answer is actually "a. true". When the net force on an object is 0 N, it means that all the forces acting on the object are balanced and cancel each other out. As a result, the object will either be at rest or continue moving at a constant velocity (if it was already in motion). Unbalanced forces, on the other hand, result in a change in motion.
To determine the answer, you can recall that net force is the vector sum of all the individual forces acting on an object. If the net force is 0 N, it means the forces are balanced.
Question #2: The correct answer is "b. Science requires special measurements that are not used in everyday life". Scientists use the metric system, including meters, because it provides a standardized and universally accepted system of measurement that is used across scientific disciplines. The metric system is based on powers of 10, making calculations and conversions easier. While accuracy is important, it is not the main reason scientists use meters.
To answer this question, you can eliminate option "c" since not all scientists use meters exclusively. Then consider the fact that the metric system is used for scientific purpose globally, not just in the United States, so option "b" is the most accurate answer.
Question #3: The correct answer is "d. air resistance". Air resistance, or drag, is a force exerted on an object moving through the air. In the case of a feather and a bowling ball falling, the feather experiences more air resistance due to its larger surface area and shape. This air resistance slows down the feather's descent compared to the bowling ball.
To determine the answer, you can eliminate options "a", "b", and "c" as they are not relevant to the scenario. Then consider the effect of air resistance on objects falling through air, which leads to the correct answer "d".
Question #4: The correct answer is "c. water". In this scenario, the reference point is the point or object to which the motion of another object is compared. As the small fish watches the shark swim by the large rock, the fish is using the water as the reference point to observe the motion of the shark and the rock.
To answer this question, you can eliminate options "a", "b", and "d", as they are not the reference point in this scenario. Then consider what the fish is observing and comparing the motion to, which leads to the correct answer "c".
Question #5: The correct answer is actually "c. two stars very far away from each other". Gravitational pull depends on the mass of the objects and their distance from each other. While stars have a strong gravitational pull, being very far away from each other weakens the gravitational force between them.
To determine the answer, you can eliminate options "a" and "b" as they refer to buildings, which typically have much lower mass than stars. Then consider how the distance affects the strength of gravitational pull, leading to the correct answer "c".
Question #6: The correct answer is "a. rolling friction". The design of a maglev train, which uses powerful magnets to lift the train above the tracks, reduces the force of rolling friction. By eliminating actual contact between the wheels and the tracks, rolling friction, which opposes the motion of an object rolling on a surface, is minimized.
To determine the answer, you can eliminate options "b", "c", and "d" as they are not directly affected by the maglev train's design. Then consider what force is reduced by the design, leading to the correct answer "a".
Question #7: The correct answer is "d. A train remains at a constant speed as it moves around a bend". A change in velocity involves a change in speed, direction, or both. When a train moves around a bend at a constant speed, the direction of the velocity changes, making it a demonstration of a change in velocity.
To determine the answer, you can eliminate options "a", "b", and "c" as they involve changes in velocity. Then consider the scenario where velocity remains constant, leading to the correct answer "d".
Question #8: The correct answer is "a. size of object". To describe motion, you need to measure the distance the object traveled, its velocity (speed and direction), and its acceleration. The size of the object is not necessary to describe its motion.
To determine the answer, you can recall the essential measurements required to describe motion, leading to the correct answer "a".
You're welcome! If you have any more questions, feel free to ask.