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Match each example with the correct form of energy transfer.

*
5 points
Conduction Convection Radiation
Boiling macaroni in a pot
Heat coming off the pavement in the summer
Ironing your clothes
Lightbulb in your house
Metal spoon transferring heat from pot to you.
Boiling macaroni in a pot
Heat coming off the pavement in the summer
Ironing your clothes.

11 answers

Sure! Here's the correct matching of each example with the form of energy transfer:

  1. Conduction:

    • Metal spoon transferring heat from pot to you.
    • Ironing your clothes.

  2. Convection:

    • Boiling macaroni in a pot.

  3. Radiation:

    • Heat coming off the pavement in the summer.
    • Lightbulb in your house.

Let me know if you need anything else!

Match the term with the correct examples and defintions.
*
6 points
speed velocity acceleration
measurement of the distance an object traveled in a specific time
slowing down at a red light
speed and direction an object traveled
25 km/hr
change in speed and/or direction
100 km/hr north
measurement of the distance an object traveled in a specific time
slowing down at a red light
speed and direction an object traveled
25 km/hr
change in speed and/or direction
100 km/hr north

Here’s a matching of the terms with their correct examples and definitions:

  1. Speed:

    • Definition: measurement of the distance an object traveled in a specific time
    • Example: 25 km/hr

  2. Velocity:

    • Definition: speed and direction an object traveled
    • Example: 100 km/hr north

  3. Acceleration:

    • Definition: change in speed and/or direction
    • Example: slowing down at a red light

Let me know if you need further assistance!

What causes a change in an object's motion?
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1 point
balanced force
unbalanced force
acceleration
inertia
2. What will happen to an object in motion if an unbalanced force does not act on it?
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1 point
it will slow down eventually
it will stop
it will keep moving at the same velocity forever
its speed or direction will change
3. Inertia is a force.
*
1 point
True
False
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Here are the answers to your questions:

  1. What causes a change in an object's motion?

    • Answer: unbalanced force
      Unbalanced forces cause an object to accelerate, decelerate, or change direction.

  2. What will happen to an object in motion if an unbalanced force does not act on it?

    • Answer: it will keep moving at the same velocity forever
      According to Newton's First Law of Motion, an object in motion will remain in motion at a constant velocity unless acted upon by an unbalanced force.

  3. Inertia is a force.

    • Answer: False
      Inertia is not a force; it is a property of matter that describes an object's resistance to changes in its state of motion.

Feel free to ask if you have any more questions!

When a ball is thrown up into the air, what two forces are at work?
*
1 point
Gravity
Air Resistance
Friction
Inertia

When a ball is thrown up into the air, the two forces at work are:

  1. Gravity - This force pulls the ball downward toward the Earth.
  2. Air Resistance - This force acts against the motion of the ball as it moves upward and eventually downward.

So the correct answer is Gravity and Air Resistance.

If you have any more questions or need further clarification, feel free to ask!

How does a spacecraft leave the surface of the Earth?
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1 point
The spacecraft produced an upward force of thrust that was equal to the downward force of gravity.
The spacecraft produced an upward force of thrust that was greater than the downward force of gravity.
The spacecraft produced a downward force of thrust that was equal to the downward force of gravity.
The spacecraft produced a downward force of thrust that was less than the downward force of gravity.

The correct answer is:

The spacecraft produced an upward force of thrust that was greater than the downward force of gravity.

This upward thrust allows the spacecraft to overcome the gravitational pull of the Earth and leave its surface. If the thrust is equal to or less than the force of gravity, the spacecraft would not be able to ascend.

The force of gravity occurs between all objects that have mass.
*
1 point
True
False
The table below shows Herman's mass and the mass of different planets in our solar system.

If Herman were to stand on each planet, which list correctly orders the planets from most gravitational force to least gravitational force?
*
1 point
Captionless Image
Earth, Mars, Venus
Earth, Venus, Mars
Venus, Mars, Earth
Venus, Earth, Mars
When an astronaut is on a spacewalk and is moving away from the space shuttle, how is the force of gravity between the two objects affected?
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1 point
It increases
It decreases
It increases for the astronaut and decreases for the space shuttle
It decreases for the astronaut and increases for the space shuttle
Which of the diagrams shows the greatest gravitational force?
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1 point
Captionless Image
I
II
III
IV
Which statement correctly describes the factors affecting gravitational force between two objects?
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1 point
Gravitational force between two objects is determined by their masses and the distance between their outermost edges.
Gravitational force between two objects is determined by their masses and the distance between their centers.
Gravitational force between two objects is determined by their volumes and their acceleration relative to the Sun.
Gravitational force between two objects is determined by their diameters and their distance from the Sun.
A student claims that the gravitational force between two objects depends upon the mass of the objects and the distance between them. Which argument best supports the student's claim?
*
1 point
If the distance between two objects increases, the gravitational force between the objects will decrease.
If the distance between two objects decreases, the gravitational force between the objects will disappear.
If the distance between two objects increases, the gravitational force between the objects will increase.
If the distance between two objects decreases, the gravitational force between the objects will not change.
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Here are the answers to your questions:

  1. The force of gravity occurs between all objects that have mass.

    • Answer: True
      Gravity is a universal force that acts between all objects that have mass.

  2. If Herman were to stand on each planet, which list correctly orders the planets from most gravitational force to least gravitational force?
    (Without the actual masses of planets or the table, I will provide the general answer based on known gravitational forces of the planets.)

    • Answer: Earth, Venus, Mars
      Earth has the strongest gravitational pull, followed by Venus, and Mars has the least gravitational pull.

  3. When an astronaut is on a spacewalk and is moving away from the space shuttle, how is the force of gravity between the two objects affected?

    • Answer: It decreases
      As the astronaut moves farther away from the space shuttle, the gravitational force between them decreases due to the increase in distance.

  4. Which statement correctly describes the factors affecting gravitational force between two objects?

    • Answer: Gravitational force between two objects is determined by their masses and the distance between their centers.
      The gravitational force depends on the mass of the objects and the distance between their centers of mass.

  5. A student claims that the gravitational force between two objects depends upon the mass of the objects and the distance between them. Which argument best supports the student's claim?

    • Answer: If the distance between two objects increases, the gravitational force between the objects will decrease.
      This statement supports the idea that gravitational force decreases with increasing distance.

If you need further clarification or have any more questions, feel free to ask!