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Transcript

8th Grade Physical Science Chapter Two Vocabulary 1. Motion – change in position relative to a reference point 2. Frame of Reference – the background used to compare motion 3. Distance – how far something has moved 4. Displacement – the distance and direction of the change in position from a starting point 5. Speed – distance traveled in a given amount of time s = d/t 6. Constant Speed – speed that does not change during the interval 7. Average Speed – total distance traveled divided by the total time it takes 8. Instantaneous Speed – speed at any given point in time 9. Velocity – speed in a given direction 10. Acceleration – change in velocity; change in the speed and or direction of an object’s motion a = Vf – Vi / t 11. Force – a push or pull on an object 12. Net Force – the combination of all forces on an object (forces in the same direction add, forces in opposite directions subtract), a net force on an object will change its motion 13. Balanced Forces – equal forces in opposite directions cancel or are balanced, there is no net force and no change in motion 14. Inertia – the tendency of an object to resist changes in its motion, increases with mass