3Distance 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.
4DistanceDistance can tell us how big an object is (the size) and how far it has travelled.
5Distance 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
6Time 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”
7Time & DistanceWe can use time and distance together to determine things like speed.
8Period & 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.
9Period & 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.
10Period & 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
11Graphs and the Slope of a Line The angle or “steepness” of a straight line on a graph.
12Graphs 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.