What measurements do we use to describe the world around us?

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Presentation transcript:

What measurements do we use to describe the world around us? Time & Distance Key Question: What measurements do we use to describe the world around us?

How do we use time? 1.To determine time of day 2.To determine the amount of time between two moments

What is the difference between accuracy, precision, and resolution? Accuracy – Correct in all detail. Precision - trying to specify details exactly Resolution – The degree of visible detail

Why are accurate measurements of time necessary? To determine the actual amount of time between two moments. What units are used to measure time? Second, minute, hour, day, week, month, year, etc.

What is speed? The rate at which something moves.

How do we measure and communicate length and position? Use a ruler or other measuring device. The main units we will use are: kilometers, meters, centimeters, & millimeters

What are the factors that affect the speed of a car rolling down a hill? Distance allowed to roll before measure speed. Distance over which speed is measured Weight Angle of the slope Friction

How is speed measured? Speed = Distance ÷ Time v = d/t d = vt t = d/v Velocity = the speed of something in a given direction

Copy this graph into your notes and describe what is happening.

What's happening in this Graph? In the first 5 seconds how far did the person travel? How far did the person move in the next 10 seconds? How far did the person move in the last 15 seconds? 4 m 0 m 7 m What was the person’s average speed from: time = 0 s to time = 5 s time = 15 s to time = 30 s time = 0 s to time = 30 s 0.8 m/s 0.47 m/s 0.37 m/s

What measurements do we use to describe the world around us?