Gravity Physical Science Section 3 2 Gravity All

Gravity Physical Science Section 3. 2

Gravity All objects have a gravitational attraction for all other objects n Law of Gravitation- Any two masses exert an attractive force on each other n Attractive force depends on n Mass of each object and distance between objects Greater mass = greater attraction

Gravity Closer together= greater attraction n Gravity is a long range force n n n Force of gravity near Earth’s surface n n The attraction between 2 objects NEVER entirely disappears F = m x 9. 8 m/s 2 Free Fall- When an object is influenced only by the force of gravity

Gravity Greater mass = greater inertia, so even with more attraction to the earth, objects fall at the same rate n Gravity pulls you toward the floor n n n The floor exerts an equal upward force on you, preventing you from falling Weight- gravitational force exerted on an object

Gravity n Travel away from earth = increase in distance n n n Increasing distance = decrease in gravitational attraction Weight would decrease. Mass would be the same Astronauts- constantly falling toward the earth at the same rate as the space shuttle

Gravity n Projectiles- Objects thrown or shot through the air n n Horizontal and vertical velocities Horizontal- force that sets object in motion Vertical- gravity Dropping item off a cliff and shooting item off a cliff will result in both items falling in the same amount of time n Same vertical distance and pull of gravity

Gravity Acceleration toward center of a circlecentripetal acceleration n Centripetal force- A force acting on an object in a direction toward the center of a curve n Satellites orbit the Earth because Earth’s gravity exerts a centripetal force on the satellite n