2 Mass – What is it? Mass is the amount of matter an object contains. Matter is anything that has mass & takes up spaceMass is ALWAYS constantIt doesn’t change depending on where it is & it IS NOT dependent on gravity.Measured by using a balance comparing a known amount of matter to an unknown amount of matter
3 Weight – What is it?Weight is the measure of the force of gravity acting on an objectWeight changes with locationFor example, my dog, Asa weighs 13.4 lbs (6kg) on Earth. If he were sent into space, he would weigh NOTHING!His weight would change on different planetsDifferent planets have different gravity fields
4 Weight – What is it? Measure of force of gravity acting on an object Changes with locationWeight of an object changes if the gravity acting on that object changesWeight = mass x gravityMeasured with a scaleMeasuring the pull of gravity
5 What is volume?Volume is the measure of the amount of space that a solid, liquid, or gas occupiesThere are several common units of measure for volume:mL (liquids)Cm3
6 How is volume measured? Direct measurement of liquid (units = mL) Displacement of liquid by a solid (units mL changed to Cm3 )L x W x H of a cube or rectangular solid (units are Cm3 )
7 What is density?Density is the amount of something in a particular area or spaceThe amount of “stuff” in a space
8 Calculating Density (I) heart density! We can calculate density by using the formula: Density=mass/volumeD= m/v(I) heart density!
9 Questions?? Complete worksheets for class work/homework Ask questions if you need help!!