Astro 7N psu Exam 1 Unit 1 & 2.pdf file:///C:/Users/HP/Desktop/dddd/Astro%207N%20psu%20Exam%2
Astro 7N PSU Exam 1 Unit 1 & 2 Actual
Questions & Answers
1. Newton's first law of gravity
Answer an object at rest or in motion in a straight line at aconstant speed will remain in that
state unless acted upon by a force
2. Newton's second law
Answer force=mass x acceleration
-if the same amount of force is applied to two objects the object with a smaller masswill move
faster
3. Newton's third law
Answer every action has an equal and opposite reaction
4. Surface gravity on a planet
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,Astro 7N psu Exam 1 Unit 1 & 2.pdf file:///C:/Users/HP/Desktop/dddd/Astro%207N%20psu%20Exam%2
Answer g= mass/radius^2
5. more mass = stronger surface gravity
Answer if the mass of a planet were twice thatof another but they had the same radius the
gravity felt on the surface of the moremassive one would be twice as strong
6. Newton's Universal law of gravitation
Answer -force of attraction that exists betweenall objects in the universe
-force= (mass of object 1) x (mass of object 2)/ distance between the objects ^2
7. What causes day and night?
Answer rotation of the earth on its axis
8. How does the sun appear to move in the sky in the course of a day?
Answer east towest, because of earth's rotation
the stars and the planets move in the same way from our point of view because ofearths
rotation
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