2 ways to have positive acceleration

speed up in + direction or slow down in the - direction

2 ways to have negative acceleration

slow down in the + direction or speed up in the - direction

2 ways to have zero acceleration

stay at rest or constant velocity

speed up, slow down or change direction

2 ways to have zero displacement

do not move or return to starting position

object is moving with constant velocity

diagonal line on position vs. time graph

object is speeding up or slowing down

diagonal line on velocity vs. time graph

horizontal line on a position vs. time graph

object is moving with constant velocity

horizontal line on a velocity vs. time graph anwhere but on x-axis

10/30 Friday Check-In : Motion Review

10/30 Friday Check-In: Atoms and Periodic Table Review

Friday 10/30

Fall Forward, Spring Back It was the first Friday in November. Daylight Saving Time ended that Sunday. The fall parade was Sunday, too. "Remember to set your clocks back an hour on Saturday night," said Nola's teacher. "Spring forward, fall back," he added. Nola didn't pay much attention. She was always late for everything anyway. She figured she always would be. At dinner, though, she asked her mom if they could go to the parade. "I won't be here Sunday, but I'll bet Pablo could take you," Mom said. Nola looked at Pablo, her sleеру big brother. He nodded-and yawned. Saturday morning, their mom drove to the airport. Saturday night, Nola thought back to her teacher's words: "Spring forward, fall back." Or was it "Fall forward, spring back"? "Fall forward" sounded better, so she set her clock forward an hour. Just like that, it was past her bedtime. She was late again. "Time is not my friend," Nola sighed. The next morning when Nola woke, her clock said 10:15. The parade began at ten o'clock. Nola and Pablo ran to the parade route, but there was no parade. It seemed they'd missed the whole thing. They turned and headed home. On their way back, they spotted their neighbor Frank. He was climbing around next to an eight-foot pumpkin float. "The early bird gets the worm!" he shouted, then asked for their help. They worked on his float for more than an hour. Then Frank clapped his hands. "Let's get to that parade!" he cried. Nola and Pablo blinked in confusion. "Wait a minute," Nola said. "Wasn't the parade at ten o'clock today?" she asked. "Was at ten?" Frank asked. "Will be at ten is more like it!" he cried. He thrust his watch toward them. It said 9:30. Nola laughed for joy. She had jumped forward an hour when everybody else had jumped back. That meant she and Pablo were now two hours ahead of everybody else. For once in their lives, they were early! "The early bird gets the worm!" Nola cried. Frank nodded. "You've got it, missy," he said. Pablo yawned. It was all a big mistake, but it turned out to be a great mistake. It's why they rode in the parade that year, and every year since. It's also why, from that day on, Nola has been early for everything. Two minutes early, though-not two hours.

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