1. Gravity and Motion

2. Acceleration due to gravity Acceleration-the rate at which velocity changes over time. All objects accelerate toward Earth at a rate of 9.8 meters per second per second.

3. Terminal velocity The constant velocity of a falling object when the force of gravity is balanced by air resistance. The parachute increases the air resistance of this sky diver and slows him to a safe terminal velocity.

4. Orbit The path of one object around in space.

5. Free Fall The motion of a body when only the force of gravity is acting on the body.

6. Centripetal Force An unbalanced force that cause objects to move in a circular path.

7. Air Resistance The force that opposes the motion of objects through air.

8. Momentum The momentum of an object depends on the object’s mass and velocity. The more momentum an object has, the harder it is to stop the object or change its direction. Momentum (p) can be calculated with the equation below: p = mass × velocity

9. Projectile Motion The curved path of a thrown object near Earth’s surface.

10. Projectile Motion Vertical –Vertical motion is motion that is perpendicular to the ground. Gravity pulls everything on Earth downward toward the center of Earth. A ball in your hand is prevented from falling by your hand. After you throw the ball, gravity pulls it downward and gives the ball vertical motion. Horizontal- horizontal motion is motion parallel to the ground.

11. Question 1 The path of one object around in space Orbit

12. Question 2 An unbalanced force that cause objects to move in a circular path Centripetal force

13. Question 3 The motion of a body when only the force of gravity is acting on the body Free fall

14. Question 4 The curved path of a thrown object near Earth’s surface Projectile Motion

15. Question 5 The constant velocity of a falling object when the force of gravity is balanced by air resistance Terminal Velocity

16. Question 6 The force that opposes the motion of objects through air Air Resistance