logging in or signing up gravity bsndev Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Copy Does not support media & animations WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 1646 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: September 05, 2009 This Presentation is Public Favorites: 2 Presentation Description No description available. Comments Posting comment... By: dkma (25 month(s) ago) Please allow me to download its urgent Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Slide 1: Gravity Define gravity, terminal velocity and free fall Explain the universal law of gravitation Aristotle : Aristotle Ancient Greece around 400 BC He believed that the heavier the object, the faster it falls. Slide 3: Galileo theorized that all objects will land at the same time when they are dropped from the same height. Gravity – the attractive force between all objects in the universe. Slide 4: Objects fall to the ground at the same rate because acceleration due to gravity is the same for all objects. Slide 5: What is gravity? Galileo helped us understand gravity as a force that exists between the Earth and objects. Newton showed that the same force exists between all objects. Even today, no one knows exactly why objects attract each other. It all starts with an apple… : It all starts with an apple… Isaac Newton 1655 The Law of Universal Gravitation : The size of the gravitational force depends on two things: Mass of the objects Distance between the objects The Law of Universal Gravitation What is weight? : What is weight? Weight is a measure of the gravitational force exerted on an object. Since gravity is a force and weight is a measure of gravity, weight is expressed in newtons (N). Gravity &Acceleration : Gravity &Acceleration The rate at which objects accelerate towards Earth is 9.8 m/s2. It is the same for all objects, regardless of their mass. 9.8 19.6 29.4 39.2 49 58.8 68.6 Air Resistance : Air Resistance The amount of air resistance depends on the size and shape of an object. Gravity pulls an object down, towards the Earth. Air resistance pushes an object up, or away from the Earth. Free Fall : Free Fall When there is no air resistance, an object is in free fall. An object is in free fall only if gravity is pulling it down and no other forces are acting on it. Terminal Velocity : Terminal Velocity The force of gravity is equal to the force of air resistance This is the highest velocity reached by a falling object thus it has 0 acceleration and falls with constant velocity. You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.