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
1. False. The forces are balanced.
2. Air resistance.
7. Size of an object.
Who needs all of the answers I have them no LYE
Jt what are they
1. The statement is false. If the net force of an object is 0 N, the forces are considered balanced, not unbalanced. To determine if the forces are balanced or unbalanced, you need to find the vector sum of all the individual forces acting on the object. If this sum is zero, the forces are balanced.
2. The force that causes a feather to fall slower than a blowing ball is air resistance. When an object moves through the air, it experiences a force of air resistance that opposes its motion. The larger the surface area of the object, the greater the air resistance it will experience. Since a feather has a larger surface area compared to a bowling ball, it experiences more air resistance, causing it to fall slower.
3. The reference point in this scenario is the large rock. A reference point is a location used to describe the position or motion of an object. In this case, the small fish is observing the shark swim by the large rock, so the rock serves as the reference point.
4. The pair of objects that would have the strongest gravitational pull is two stars very close to each other. The gravitational force between two objects depends on their masses and the distance between them. If two objects have a large mass and are close together, the gravitational force between them will be stronger. In this case, two stars very close to each other would have a stronger gravitational pull compared to the other options.
5. A maglev train reduces air resistance. Air resistance is the force that opposes the motion of an object as it moves through the air. By using powerful magnets to lift the train above the tracks, the maglev train eliminates contact with the tracks, reducing the friction and air resistance it experiences.
6. The example that does not demonstrate a change in velocity is "A train remains at a constant speed as it moves around the 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, then its velocity remains constant. In the other examples, there are either changes in speed, direction, or both, which result in changes in velocity.
7. The quantity that does not need to be measured in order to describe motion is the size of an object. When describing motion, you typically focus on factors such as distance traveled, velocity (speed and direction), and acceleration. The size of an object does not directly affect its motion and is not necessary to describe its movement.