15 Motion Ms. Bachman

Vocabulary Motion Reference point International system of units (SI) Distance Speed Average speed Instantaneous speed Velocity Acceleration Deceleration

What is Motion? Motion- an object is in motion if its position changes relative to another object Reference point- place or object used for comparison to determine if something is in motion **You may or may not be moving based on the reference point you choose Ex. your position compared to the sun

Measuring distance Distance- length of the path between 2 points Measured in meters (m) International system of units(SI)- system of measurement

Speed Speed- the distance an object moves per unit of time Type of rate Divide the distance the object travels by the amount of time it takes to travel that distance

Average speed Average speed- divide the total distance traveled by the total time Total distance 3km + 50km +12km = 65km Total time 1h + 3h + 1h = 5h Average speed 65km/ 5h= 13km/h

Instantaneous speed Instantaneous speed- speed at which an object is moving at a given instant in time *greater average speed wins the race

Velocity Velocity- speed in a given direction Describes both speed and direction of an object Can involve change in speed, direction, or both

Acceleration Acceleration- the rate at which velocity changes Refers to increasing speed, decreasing speed, or changing directions Whenever an object changes speed, the object accelerates Deceleration- slow down, negative acceleration

Videos https://www.youtube.com/watch?v=xKmhS4qLj_s