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Lesson 15 - Gravity and Orbital Motion
Flashcards for Lesson 15 Quiz
11
Science
8th Grade
01/30/2013

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Cards

Term
Which Law states that a body in motion tends to travel in a straight line unless it is disturbed by an unbalanced force?
Definition
Inertia
Term
If two forces are of equal magnitude (size) and opposite in direction, then the forces are .....
Definition

balanced

 

Term
Any two objects, from the largest galaxy down to the smallest particles, attract each other with a force called ....
Definition
gravity
Term
Unbalanced forces, including gravity, can change the ______________________ of an object's motion.
Definition
speed and/or direction 
Term
Describe the path of something that has forward motion but is also being pulled down by gravity.
Definition
Its path would curve.
Term
Planets are kept in orbit by the forces of inertia and the Sun's gravity. What would happen to the planets if the Sun's gravity disappeared?
Definition
The planets would move off into space in a straight path.
Term
The inner planets in the solar system have the fastest orbital speeds. Why?
Definition
The inner planets are closer to the Sun, so the Sun's gavity is stonger which means the planets must move faster to stay in orbit.
Term
What causes Stars to wobble?
Definition
The gravity of planets pulling on the star.
Term
The faster the satellite or orbiter's orbital speed, the more _____________ the planet it is orbiting.
Definition
massive
Term
If an egg falls out of a bird nest sitting on a tree branch, when does gravity act on the egg?
Definition
At all times, even when sitting in the nest.
Term
The Law of Universal Gravitation states that any two objects attract each other. What two factors determines how much they attract each other?
Definition
the mass of the each object and the distance between them.
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