2.  Objects fall to the ground at the same rate because the acceleration of gravity is the same for all objects.  Acceleration depends on force and mass.

3.  An object with more mass experiences a greater gravitational force than a lighter object.  But the heavier object is harder to accelerate because it has more mass.  The extra mass of the heavy object balances out the additional gravitational force.

4.  Acceleration is the rate at which velocity changes over time.  All objects accelerate toward Earth at a rate of 9.8 meters per second per second or (m/s²).  So every second an object falls its downward velocity increases by 9.8 m/s.

5. In this example, the acceleration of gravity has been rounded to 10 m/s².

6.  Change in velocity (∆ V)=g X t  g= gravity (9.8 m/s²)  t=time

7.  During 1 st second of acceleration an object falls 4.9 m, which is half of 9.8 m/s².  This happens because it takes time for objects to reach the acceleration of 9.8 m/s².  After first second add 9.8 m for every second an object falls.

8.  The force that opposes motion of objects through air.  Depends on the size, shape, and speed of an object.  Larger surface area usually encounter more air resistance.

9.  As the speed of a falling object increases, air resistance also increases.  The upward force of air resistance continues to increase until it equals the downward force of gravity.  The net force would now be O N and an object has stopped accelerating which is called terminal velocity.

11.  An object is in free fall only if gravity is pulling it down and no other forces, such as air resistance, are acting on it.  Basically free fall can only occur where there is no air such as in a vacuum or space. https://www.youtube.com/watch?v=KDp1tiUsZw 8

12.  An object is orbiting when it is traveling around another object in space.  Objects are always free falling while in orbit. https://www.youtube.com/watch?v=tAUXIEr-VzM

13.  We know that astronauts are not weightless in space due to the fact that they still have mass which means there is gravity.  Astronauts float in their space shuttles because they are free falling with their shuttles.

14.  Objects in orbit move in a circular path and are constantly changing direction.  There is an unbalanced force that causes objects to move in a circular path.  Gravity provides the centripetal force that keeps objects in orbit.