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Chapter 9 Motion
vocabulary
Term | Definition |
---|---|
motion | the state of an object when distance from another object is changing |
reference point | a place or object used for comparison to determine if something is in motion, it must be a stationary object (tree, building, signs) |
international system of units | units of measurements that scientist worldwide use to communicate clearly, these are also known as SI units |
meter | the SI unit to measure distance/length is the meter, a meter is a little longer than a yard |
speed | the distance an object travels per unit of time, ex: a car travels at a rate of 60 miles per hour (mph) |
average speed | is the total distance an object travels divided by the total amount of time it took that object to go that distance |
instantaneous speed | the rate at which an object is moving at a given instant in time |
velocity | the speed AND direction in which an object is moving, ex: a storm can travel 25 km/h eastward |
slope | the steepness on a line graph, a way to show a change in motion,it tells you how fast one variable changes in relation to the other variable in the graph |
acceleration | the rate at which velocity(speed and direction) changes, this can occur by either increasing speed, decreasing speed, or changing directions |