8th Grade – Science Al-Ghazaly School Motion  8th Grade – Science Al-Ghazaly School

Reference point Position Motion Distance Displacement

Explain your understanding of a Reference point Objectives Define Motion Explain your understanding of a Reference point What is the standard unit used to measure distances?

International System of Units Key words and terms Motion Reference point Distance International System of Units

When is an object in Motion? An object is in motion if its position changes relative to another object.

Reference point A place or object used to determine if something is in motion. Eg: a tree or building

Distance and displacement Distance: The length of the path between two points Displacement: the difference between the initial position and the final position of an object

What is distance? Distance is the measure of how far it is from one point to another. The international system of units measures distance in centimeters, meters and kilometers. A B

International System of Units: Meters (M) Measuring distance International System of Units: Meters (M)

Conclusion An object is in motion if it changes position relative to a reference point. A reference point is a place or object used for comparison to determine if something is in motion. To determine motion for an object moving on or near Earth’s surface, a reference point that is fixed to Earth, such as a building or tree, is usually used.

Questions Which is not an SI base unit? Kilogram Mile Meter Second When is an object said to be in motion? Define Reference Point If you walk 2km from your home to a store and then back home, what is your displacement?