1. Gravitational Force  Gravity= a force of attraction between objects, “pulls” objects toward each other  Law of universal gravitation= all objects in the universe attract each other through gravitational force  The size of the force depends on MASS and DISTANCE

2. Weight  Weight= a measure of the gravitational force exerted on an object

3. Acceleration due to gravity  Acceleration due to gravity= all object fall to the ground at the same rate of 9.8 m/s 2 Formula Velocity= acceleration due to gravity X time Velocity= g X t  *****ALWAYS= g = acceleration due to gravity= 9.8 m/s 2

4. Air resistance  Air resistance= opposes the motion of objects through the air, example of fluid friction Air resistance gravity

5. Terminal Velocity  Terminal velocity= the constant velocity of a falling object when the size of the upward force of air resistance MATCHES the downward force of gravity

6. Free Fall  Free fall= the condition of an object is in when gravity is the ONLY force acting on it

7. Review Questions: 1.How does the mass of an object relate to the gravitational force the object exerts on other objects? 2.How does the distance between objects affect the gravity between them?