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### 7 Cards in this Set

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 Define Acceleration. change in speed or direction define deceleration a decrease in speed. What causes deceleration? gravity and friction cause deceleration Define velocity. speed and direction Define speed. distance traveled in a certain amount of time define metric system a system of measurement How would you find the average speed of a bug that moves: Day 1: 4km/h Day 2: 5km/h Day 3: 3 km/h? Add: 4+5+3. Then divide by 3. 4+5+3=12 12:3=4 Average: add the numbers and divide by how many are in the group.