9. 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.
5 answers
The spacecraft produced an upward force of thrust that was greater than the downward force of gravity.
10. What are the action and reaction forces at work in this picture?
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1 point
Captionless Image
the book is pushing on the table and the table is pushing on the book
gravity is pulling the book downward
the flower vase is pushing up and gravity is pulling down
friction is pushing up and gravity is pulling down
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1 point
Captionless Image
the book is pushing on the table and the table is pushing on the book
gravity is pulling the book downward
the flower vase is pushing up and gravity is pulling down
friction is pushing up and gravity is pulling down
Without being able to see or contextualize the image, it is not possible to determine the action and reaction forces at work in the picture. Therefore, none of the provided options can be definitively chosen as the correct answer.
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
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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
If an unbalanced force does not act on an object in motion, it will keep moving at the same velocity forever.
1 answer