Comparing and Contrasting In our daily lives, there are several instances wherein we compare things. We compare quantities such as height, speed of objects, and temperature. We also compare and contrast information to understand our observations. To compare, we tell how things are alike; to contrast, we tell how things are different. In physics, we compare quantities such as the speed of objects. For instance, speed of a jeepney = 60 kilometers per hour (km/h) speed of a bus = 120 kilometers per hour (km/h) To express the comparison of speed between the jeepney and the bus, we say that "the speed of the jeepney is two times the speed of the bus, or "the speed of the bus is half the speed of the jeepney." Another way of comparing the two quantities is by giving the ratio as speed of the bus: speed of the jeepney which is 120 km/h: 60 km/h - or 120 2. 60 1 2 : 1 Thus, th units must be similar. If the units of​