Free ACT Test Exam Braindumps (page: 143)

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Why does an arrow shot from a bow eventually hit the ground?

Impetus Theory

The ancient theory of impetus was used to explain why objects continue to move even when they were no longer acted on, for example, an arrow shot by a bow. The theory of impetus says that the bow imparts a certain amount of the property of motion to the arrow. This property of motion is called impetus. Impetus is then a property of the bow that is imparted to the arrow. This is what causes the arrow to fly through the air. According to the theory of impetus, only a limited amount of motion is imparted to the arrow by the bow. Once this runs out, the arrow will fall abruptly to the ground. You can think of this theory as being similar to a gas tank. The action of the bow fills the tank of the arrow with a certain amount of "motion" or impetus; once the tank is empty the arrow doesn't move anymore. Furthermore, this theory predicts that the impetus is used up at a steady rate. So, when it runs out, it runs out abruptly. This yields the prediction that when the arrow uses up the impetus imparted to it by the bow it will stop in midair and then fall straight down to earth. For an object to continue moving forever in a straight line the impetus theory predicts that it would have to be given an infinite amount of impetus.

Inertia Theory

Inertia is the property of an object to remain at rest or in motion with constant velocity unless acted on by a net force. According to the theory of inertia, an arrow will continue to move in its state of motion with constant velocity unless acted on by a force. The force in this case is the gravity of the Earth acting on the arrow. The force of gravity gradually causes the arrow to fall toward the earth as it travels horizontally, which means the arrow follows a parabolic path. Finally, according to the theory of inertia, if an object is not acted on by a net force, it would continue moving forever in a straight line at constant velocity.

According to the impetus theory, for an object to continue moving in a straight line at constant velocity what conditions must be true?

  1. According to the impetus theory, the object must be given infinite impetus.
  2. According to the impetus theory, the object must have no net force on it.
  3. According to the impetus theory, the object must be given infinite impetus.
  4. According to the impetus theory, the object must have gravity providing the impetus.

Answer(s): A

Explanation:

For an object to continue moving forever in a straight line with constant velocity, the impetus theory requires that the object be given an infinite amount of impetus.



Why does an arrow shot from a bow eventually hit the ground?

Impetus Theory

The ancient theory of impetus was used to explain why objects continue to move even when they were no longer acted on, for example, an arrow shot by a bow. The theory of impetus says that the bow imparts a certain amount of the property of motion to the arrow. This property of motion is called impetus. Impetus is then a property of the bow that is imparted to the arrow. This is what causes the arrow to fly through the air. According to the theory of impetus, only a limited amount of motion is imparted to the arrow by the bow. Once this runs out, the arrow will fall abruptly to the ground. You can think of this theory as being similar to a gas tank. The action of the bow fills the tank of the arrow with a certain amount of "motion" or impetus; once the tank is empty the arrow doesn't move anymore. Furthermore, this theory predicts that the impetus is used up at a steady rate. So, when it runs out, it runs out abruptly. This yields the prediction that when the arrow uses up the impetus imparted to it by the bow it will stop in midair and then fall straight down to earth. For an object to continue moving forever in a straight line the impetus theory predicts that it would have to be given an infinite amount of impetus.

Inertia Theory

Inertia is the property of an object to remain at rest or in motion with constant velocity unless acted on by a net force. According to the theory of inertia, an arrow will continue to move in its state of motion with constant velocity unless acted on by a force. The force in this case is the gravity of the Earth acting on the arrow. The force of gravity gradually causes the arrow to fall toward the earth as it travels horizontally, which means the arrow follows a parabolic path. Finally, according to the theory of inertia, if an object is not acted on by a net force, it would continue moving forever in a straight line at constant velocity.

According to the inertia theory, for an object to continue moving in a straight line at constant velocity, what conditions must be true?

  1. According to the inertia theory, the object must be given infinite inertia.
  2. According to the inertia theory, the object must have an infinite net force on it.
  3. According to the inertia theory, the object must have gravity as the net force acting on it.
  4. According to the inertia theory, the object must have no net force acting on it.

Answer(s): D

Explanation:

The inertia theory states that an object will continue moving in a straight line with constant velocity as long as no net force acts on it.



Why does an arrow shot from a bow eventually hit the ground?

Impetus Theory

The ancient theory of impetus was used to explain why objects continue to move even when they were no longer acted on, for example, an arrow shot by a bow. The theory of impetus says that the bow imparts a certain amount of the property of motion to the arrow. This property of motion is called impetus. Impetus is then a property of the bow that is imparted to the arrow. This is what causes the arrow to fly through the air. According to the theory of impetus, only a limited amount of motion is imparted to the arrow by the bow. Once this runs out, the arrow will fall abruptly to the ground. You can think of this theory as being similar to a gas tank. The action of the bow fills the tank of the arrow with a certain amount of "motion" or impetus; once the tank is empty the arrow doesn't move anymore. Furthermore, this theory predicts that the impetus is used up at a steady rate. So, when it runs out, it runs out abruptly. This yields the prediction that when the arrow uses up the impetus imparted to it by the bow it will stop in midair and then fall straight down to earth. For an object to continue moving forever in a straight line the impetus theory predicts that it would have to be given an infinite amount of impetus.

Inertia Theory

Inertia is the property of an object to remain at rest or in motion with constant velocity unless acted on by a net force. According to the theory of inertia, an arrow will continue to move in its state of motion with constant velocity unless acted on by a force. The force in this case is the gravity of the Earth acting on the arrow. The force of gravity gradually causes the arrow to fall toward the earth as it travels horizontally, which means the arrow follows a parabolic path. Finally, according to the theory of inertia, if an object is not acted on by a net force, it would continue moving forever in a straight line at constant velocity.

Which of the following statements is correct?

  1. Impetus is a property of the object in motion.
  2. Impetus is a property of motion that is transferred to the object in motion by the object that acts on it.
  3. Impetus is used up gradually.
  4. Impetus is the tendency of an object at rest to remain at rest unless acted on by a net force.

Answer(s): B

Explanation:

As defined by the impetus theory, impetus is the property of motion that is imparted to the object by whatever is acting on it? From the example in the reading, the impetus is a property motion of the bow that is transferred to the arrow.



Why does an arrow shot from a bow eventually hit the ground?

Impetus Theory

The ancient theory of impetus was used to explain why objects continue to move even when they were no longer acted on, for example, an arrow shot by a bow. The theory of impetus says that the bow imparts a certain amount of the property of motion to the arrow. This property of motion is called impetus. Impetus is then a property of the bow that is imparted to the arrow. This is what causes the arrow to fly through the air. According to the theory of impetus, only a limited amount of motion is imparted to the arrow by the bow. Once this runs out, the arrow will fall abruptly to the ground. You can think of this theory as being similar to a gas tank. The action of the bow fills the tank of the arrow with a certain amount of "motion" or impetus; once the tank is empty the arrow doesn't move anymore. Furthermore, this theory predicts that the impetus is used up at a steady rate. So, when it runs out, it runs out abruptly. This yields the prediction that when the arrow uses up the impetus imparted to it by the bow it will stop in midair and then fall straight down to earth. For an object to continue moving forever in a straight line the impetus theory predicts that it would have to be given an infinite amount of impetus.

Inertia Theory

Inertia is the property of an object to remain at rest or in motion with constant velocity unless acted on by a net force. According to the theory of inertia, an arrow will continue to move in its state of motion with constant velocity unless acted on by a force. The force in this case is the gravity of the Earth acting on the arrow. The force of gravity gradually causes the arrow to fall toward the earth as it travels horizontally, which means the arrow follows a parabolic path. Finally, according to the theory of inertia, if an object is not acted on by a net force, it would continue moving forever in a straight line at constant velocity.

Gravity is a type of:

  1. net force.
  2. impetus.
  3. inertia.
  4. parabolic path.

Answer(s): A

Explanation:

According to the Inertia Theory passage, gravity is a type of net force. There is no support for the other choices.



Page 143 of 260



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