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Motion in Two Dimensions
Acceleration toward the center of a curved or circular path is called centripetal acceleration. In the same way, Earth experiences centripetal acceleration as it orbits the sun in a nearly circular path
Think about the earth spinning on its axis. The earth moves in a circular path, but its speed remains constant. It is accelerating because its direction of motion changes
When you throw or shoot an object such as a rubber band, the force exerted by your hand gives the object a horizontal velocity. For example, after releasing the rubber band, its horizontal velocity is constant.
If you have ever tossed a ball to someone you have probably noticed that thrown objects do not travel in straight lines, they curve downward. Anything that is thrown or shot through the air is called a projectile Earth's Gravity causes projectiles to follow a curved path.
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