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Gravity and Motion, Newton's Laws of Motion, and Momentum- Eighth Grade Science

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Question
Answer
At what rate do objects fall to earth?   9.8 m/s^2 (9.8 meters/second squared)  
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what is the mathematical equation for the velocity of falling objects?   Δv = g*t  
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terminal velocity   the constant velocity of a falling object when the force of air resistance is equal in magnitude and opposite in direction tot he force of gravity  
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free fall   the motion of a body when only the force of gravity is acting on the body.  
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what is an example of an object in free fall?   an astronaut in space/ a feather in a vacuum  
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projectile motion   the curved path that an object follows when thrown, launched, or otherwise projected near the surface of the earth.  
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Properties of projectile motion   thrown with a horizontal push accelerated downward by gravity does not accelerate horizontally  
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newton's first law of motion   an object at rest stays at rest, and an object in motion remains in motion at a constant speed unless acted on by an unbalanced force.  
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newton's second law of motion    
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