Forces and Motion Chapter 20

2. Float in orbiting spacecrafts because of free fall.
6. Objects in projectile motion accelerate downward, meaning you must aim at a ___________.
9. Moving forward and in free fall.
10. Any object in circular motion is constantly ____________ direction.
13. The constant velocity of a falling object.(2words)
14. The unbalanced force that causes objects to move in a circular path.
16. The force that opposes the motion of objects through air. (2 words)
19. Gravity does not affect the ______________ component of projectile motion.
21. Argued that the mass of an object does not affect the time the object takes to fall to the ground.
22. All objects accelerate toward __________ at a rate of 9.8 m/s/s.

1. The curved path an object follows when it is thrown or propelled near the surface of Earth.
3. Astronauts appear to be __________ while they are floating inside the space shuttle.
4. An example of horizontal and vertical motion. (2 words)
5. Weight is a measure of __________ force.
7. A Greek philosopher who thought the rate at which an object falls depended on the object's mass.
8. Motion that is perpendicular to the ground.
11. Objects fall to the ground at the same rate because the acceleration due to __________ is the same for all objects.
12. the rate at which velocity changes over time.
15. An object is in ____________ only if gravity is pulling it down and no other forces are acting on it. (2 words)
17. Acceleration depends on both ________ and mass.
18. The extra mass of the heavy object exactly __________ the additional gravitational force.
20. The amount of air resistance acting on an object depends on size, shape, and ____________ of an object.