+ Position Reference Point – a starting point used to describe the location or the position of an object Distance – d – the total length between two point or the total length travelled Position – an object’s distance and direction from a reference point
+ Position and Direction Number lines or coordinate systems are used to specify position Objects can move in a positive and negative direction North and East – Positive direction South and West – Negative direction
+ Why is it important to include the plus and minus signs in the position? Reference Point Describe how the rhinoceros moved?
+ Distance and Displacement Motion is the process of changing position Two ways of describing motion are distance and displacement Displacement is the straight-line distance, or the difference between the initial position and the final position of an object
+ Measuring Distance and Displacement Distance moved is… 27.4 m Displacement is … 27.4 m [toward first base]
+ Measuring Distance and Displacement Distance moved is… 54.8 m Displacement is … 38.7 m [toward second base]
+ Measuring Distance and Displacement Distance moved is… 109.6 m Displacement is … 0 m Displacement is zero because the starting position and the final position are the same.
+ Scalar Quantities and Vector Quantities Distance and displacement are examples of two types of quantities. Distance is a scalar quantity. Scalar quantity that has only magnitude or size. It is represented by number and units examples: distance, time and temperature A vector is a quantity that has both magnitude and direction. You must include units. Examples: displacement and position
+ Representing Vectors Arrows are often used to represent vectors. The length of the arrow represents the size and magnitude or motion and the arrow point represents the direction of motion.
+ Resultant Vector The sum of vectors is called a resultant vector
+ Displacement Where means “change in” means change in position is position in meters, m represents the final position in meters, m represents the initial position in meters, m
+ Uniform Motion Uniform motion is motion in which the object’s displacement is equal form each time interval
+ Graphing Uniform Motion What would we graph?? Time and position What would be on the x-axis? Which is the independent variable? Time (seconds) What would be on the y-axis? Which is the dependent variable? Position (cm[right])