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s8pe-10203-ca 11/2/05 7:09 PM MAZER Page 60 Newton’s Three Laws of Motion All three of Newton’s laws work together to help describe how an object will move. Newton’s First Law Newton’s Second Law Newton’s Third Law action force acceleration force of gravity This kangaroo has jumped, setting itself in motion. If no other forces acted on it, the kangaroo would continue to move through the air with the same motion. Instead, the force of gravity will bring this kangaroo back to the ground. The large kangaroo does not have as much acceleration as a less massive kangaroo would if it used the same force to jump. However, the more massive kangaroo can increase its acceleration by increasing the force of its jump. A kangaroo applies an action force on the ground with its powerful back legs. The reaction force from the ground can send the kangaroo as far as 8 meters (26 ft) through the air. Common Name: Red kangaroo Scientific Name: Macropus rufus Home: Australia What forces are involved in a kangaroo jump? 60 Unit 1: Motion and Forces reaction force Top Speed: 65 km/h (40 mi/h) Maximum Leap: 8 m (26 ft) PDF