1. If the net force on an object is 0 N, the forces are considered unbalanced. (1 point)
true......
false
Multiple Choice
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?
(1 point)
Meters allow scientists to be more accurate in their measurements.
Science requires special measurements that are not used in everyday life.
All scientists use meters to measure distance to help eliminate confusion.....
Meters are better than feet for measuring objects in motion.
3. Which of the following forces causes a feather to fall slower than a bowling ball? (1 point)
gravity
rolling friction....
sliding friction
air resistance
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?
(1 point)
shark......
large rock
water
Pacific Ocean
5. Which of the following pairs of objects would have the strongest gravitational pull?
(1 point)
two tall 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
6.
A maglev train uses powerful magnets to lift the train above the tracks as it moves
forward. Such a design reduces which of the following forces?
(1 point)
rolling friction........
gravity
air resistance
fluid friction
7. Which of the following examples does not demonstrate a change in velocity? (1 point)
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 a field.
A train remains at a constant speed as it moves around a bend.
8. Which of the following does not need to be measured in order to describe motion?
(1 point)
size of the object
distance the object traveled
velocity of the object......
acceleration of the object
I meant to put science not algebra
check the pls @Ms.sue
plssss check
1. If the net force on an object is 0 N, the forces are considered balanced, not unbalanced. To determine whether forces are balanced or unbalanced, you need to calculate the net force by adding up all the individual forces acting on the object. If the net force is zero, it means that the forces are balanced and there is no overall change in motion.
2. Scientists in the United States use meters to measure distance because it is a standard unit of length in the metric system. The metric system is widely used in scientific research and provides a consistent and standardized way of measuring quantities. Meters allow scientists to make more accurate and precise measurements compared to feet, which is a customary unit of length in the United States.
3. The force that causes a feather to fall slower than a bowling ball is air resistance. When an object moves through the air, it experiences a resistance force due to the air molecules colliding with its surface. This force is known as air resistance, and it slows down the motion of objects. Feathers are more affected by air resistance than bowling balls because they have a larger surface area relative to their mass.
4. In the scenario of a small fish in the Pacific Ocean watching a shark swim by a large rock, the reference point would be the large rock. A reference point is a fixed location or object that is used to determine the position or motion of other objects. In this scenario, the fish is observing the motion of the shark relative to the large rock.
5. The pair of objects that would have the strongest gravitational pull is two stars very close to each other. Gravitational force depends on the masses of the objects and the distance between them. The closer the objects are to each other, the stronger their gravitational pull will be. Therefore, two stars very close to each other would have the strongest gravitational pull.
6. A maglev train using powerful magnets to lift the train above the tracks reduces the force of rolling friction. Rolling friction is the resistance encountered when one object rolls over another. By levitating the train above the tracks, the maglev train eliminates the contact between the wheels and the tracks, significantly reducing rolling friction. This allows the train to move more efficiently and with less resistance.
7. The example that does not demonstrate a change in velocity is a train remaining at a constant speed as it moves around a bend. Velocity is a vector quantity that includes both speed and direction. If an object is moving at a constant speed in a straight line or along a curved path without changing its direction, there is no change in velocity. In this case, even though the train is moving along a curved path, as long as its speed remains constant, its velocity does not change.
8. The size of the object does not need to be measured to describe its motion. When describing motion, you typically focus on variables such as distance, displacement, speed, velocity, and acceleration. Size is not directly related to the motion of an object. However, the distance the object traveled, its velocity (speed and direction), and its acceleration (rate of change of velocity) are all important factors in describing its motion.