ࡱ> PRO bjbjss 4B+++++????S?#tX#Z#Z#Z#Z#Z#Z#)%'xZ#+Z#++o#++X#X#r"T#`/?:T"D##0#b"C(~C(#C(+#DZ#Z#H#C( : Name: ____________________________________________ Date: _________________ Period: ________ Length, Time, Distance and Displacement Investigation Measuring Length EstimateEstimate in MetersActualDiameter of a Pencil EraserHeight of a Lab TableLength of a Paper ClipLength of the Classroom from Front to BackDistance From Where You Live to School Measuring Time StopwatchPhotogate TimerTrial 1Trial 2Trial 3Average 1. Which method is more accurate when measuring time? How do you know? Distance & Displacement Go to phet.colorado.edu. Click on physics and then find The Moving Man simulation. Draw a simple diagram of what you see on the screen. Include the following items on your diagram: The ruler (with markings) The two walls, tree, house, and the man (make sure each are drawn at the same point you see on the screen) Making Observations about Distance: What number and unit are written directly under the moving man? __________________ The position under the walking man which is labeled 0 meters is called the Origin. It is the point from which all motion will be referenced. You can use any point as an origin but in this case we have chosen this point. Label this point on your diagram. The amount of a certain unit between the reference point and an object is called the DISTANCE. Distance does not tell you anything about the direction from the reference point. It only has an amount and a unit. Complete the table below. The HouseThe WallThe TreeDistance from the Origin Making Observations about Displacement You may have noticed that the position of the tree has been given a negative value while the position of the house has been given a positive value. Why do has this been done? When we add a - or a + to the number we are indicating a direction. A - sign means backward or behind and a + sign means forward or in front. They indicate the direction of an object from the chosen reference point. Adding the + or - sign indicates DISPLACEMENT (not distance). Displacement, like distance has an amount (magnitude) and a unit, but displacement also has a direction. Distance does NOT have a direction. When we want to indicate direction in more than two directions (e.g. forward and backward), we use words like north, south, east, west, northwest etc. Complete the table below with proper units and signs. The HouseThe WallThe TreeDisplacement from the Origin What is the difference between an objects DISTANCE and its DISPLACEMENT? Distance of the Moving Man Move the man from the origin (0 meters) to the tree. What distance did the man travel? ___________ Move the man from the tree to the house. What distance did the man travel this time? ____________ Move the man from the house to the left wall. What distance did the man travel this time? _________ Add up the numbers in the last three steps to find the mans total distance. What was the total distance the man traveled? ____________ Displacement of the Moving Man (remember to use a positive (+) number if the man moves forward (to the right) and a negative (-) number if the man moves backward (to the left). Move the man from the origin (0 meters) to the tree. What is the mans displacement? ____________ Move the man from the tree to the house. What is the mans displacement this time? ______________ Move the man from the house to the left wall. What is the mans displacement this time? __________ Add up the numbers in the last three steps to find the mans total displacement. What was the mans total displacement? ___________ Compare the mans total displacement to his position. Whats the relationship? Click on the Charts tab. Minimize the Velocity and Acceleration graphs by clicking on the red - sign on the top right corner of the graph. Move the man and see the results on the graph. What relationship do you notice between the graph and the mans movement? 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