3 Distance Common units for distance are meters. The meter was originally defined as one ten-millionth of the distance between the north pole and the equator.
4 DistanceDistance can tell us how big an object is (the size) and how far it has travelled.
5 Distance Distances can be very small or very large. The distances in space are so large that we use light years to measure them.1 light year = 9.46 x 1015m
6 Time In general, time is the duration of an event, The duration of an event is often referred to as a time interval and we give it this symbol:ΔtΔ =delta which represents a changeSo Δt means “change in time”
7 Time & DistanceWe can use time and distance together to determine things like speed.
8 Period & FrequencyPeriod (T) is the time interval between two repeating events.It is measured in units of time.Ex. A pendulumT = the time for a complete swing back and forth or the time it takes for one cycle.
9 Period & Frequency Frequency (f) is related to period (T). It is the number of cycles that occur in a specific time interval (usually seconds).The unit for frequency is hertz (Hz) where 1Hz = 1 cycle per second.
10 Period & Frequency The formula for frequency: f = 1/T You can also calculate the number of times divided by the time interval.We can use this to calculate period if we know the frequency too:T = 1/f
11 Graphs and the Slope of a Line The angle or “steepness” of a straight line on a graph.
12 Graphs and the Slope of a Line We can use the slope to see how things like distance and time are related.We will use the x-axis for time.