4. Which is not an example of unbalanced forces acting on an object a: an acorn falling from a tree
b: a car traveling straight down a road at 40km/h
c: a motorcycle changing speed from 20 km/h to 35 km/h
d: a truck slowing down as it approaches a red light
this is science actually

did you you know

Explanation: thcco lot iof the

zfoods? ok, pressure is used to keep the heat inside and to keep the food perfect.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.