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?
gravity ←
rolling friction
sliding friction
air resistance

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?
shark
large rock ←
water
Pacific Ocean

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?
rolling friction
gravity
air resistance ←
fluid friction

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

mrs. sue please pleas pleas help

1. To determine if the statement "If the net force of an object is 0 N, the forces are considered unbalanced" is true or false, we need to understand the concept of balanced and unbalanced forces. Balanced forces occur when the net force on an object is zero, meaning that the forces are equal in magnitude and opposite in direction, resulting in no change in motion. On the other hand, unbalanced forces occur when the net force on an object is not zero, resulting in an acceleration or change in motion. In this case, if the net force of an object is 0 N, it means that the forces acting on the object are balanced, and therefore the statement is false. However, if the net force is non-zero, the forces are unbalanced.

2. To determine which force causes a feather to fall slower than a bowling ball, we need to consider the concept of air resistance. Air resistance is a force that opposes the motion of objects moving through the air. It depends on factors such as the shape, size, and speed of the object. In this scenario, the force of gravity is pulling both the feather and the bowling ball downwards. However, the feather experiences more air resistance due to its large surface area and light weight, which slows down its fall compared to the bowling ball. Therefore, the correct answer is air resistance.

3. To identify the reference point in the scenario of a small fish in the Pacific ocean watching a shark swim by a large rock, we need to understand the concept of reference point. A reference point is a location or object used to determine the position or motion of another object. In this case, the small fish is observing the shark swimming by a large rock. The large rock serves as the reference point in this scenario, as it provides a fixed object with which the fish can compare the motion of the shark. Therefore, the correct answer is the large rock.

4. To determine which pair of objects would have the strongest gravitational pull, we need to understand the concept of gravitational force. Gravitational force is an attractive force that exists between any two objects with mass. The strength of the gravitational force depends on the masses of the objects and the distance between them. In this scenario, two buildings in the same city would have the strongest gravitational pull because their masses are likely to be greater than the mass of the other objects mentioned, and their proximity increases the strength of the gravitational force. Therefore, the correct answer is two buildings in the same city.

5. To identify which force is reduced by the design of a maglev train using powerful magnets to lift the train above the tracks as it moves forward, we need to understand the concept of forces. The forces acting on the train during its motion include rolling friction, gravity, air resistance, and fluid friction. Rolling friction is the force between the wheels and the tracks, but since the train is levitating above the tracks, rolling friction is reduced. Gravity is a constant force pulling the train downward, and it is not directly affected by the design of the train. Fluid friction refers to the resistance of an object moving through a fluid (such as water or air), but it is also not directly affected by the design of the maglev train. Air resistance, however, is the force that opposes the motion of an object through the air. By using powerful magnets to lift the train above the tracks, the contact area between the train and the air is reduced, thus reducing the air resistance. Therefore, the correct answer is air resistance.

6. To identify the example that does not demonstrate a change in velocity, we need to understand the concept of velocity. Velocity is a vector quantity that includes both the speed and direction of an object. Any change in speed or direction indicates a change in velocity. In this case, an elevator slowing down to stop at the top floor demonstrates a decrease in speed and a change in velocity because both magnitude and direction are changing. A cruise ship traveling west at a constant speed demonstrates a constant velocity, as the speed and direction remain unchanged. A soccer ball being passed across the field demonstrates a change in both direction and speed, thus changing the velocity. A train moving at a constant speed around a bend also demonstrates a change in direction, even though the speed remains constant. Therefore, the correct answer is the cruise ship traveling west at a constant speed.

7. To identify the property that does not need to be measured in order to describe motion, we need to understand the concept of motion. Motion includes the change in position of an object with respect to a reference point over a period of time. To describe motion, we typically measure various properties, such as the size of an object, the distance the object traveled, the velocity of the object, and the acceleration of the object. However, the size of an object (its dimensions) is not a parameter that is essential to describing motion. Rather, it is the position, distance, velocity, and acceleration that provide a comprehensive description of an object's motion. Therefore, the correct answer is the size of an object.