1. Lecture: Volume, Weight and Mass

2. 1. All matter occupies volume and has mass A. Volume: occupies space: example? it is the third dimension 1. solids: a. right angles shapes : l x w x ht m x m x m = m 3 (what dimension/why?) b. irregular shape : water displacement: ? unit is the Liter: why? how do you convert m 3 to Liters, what’s the conversion formula? 2. liquids: a. unit is the liter b. use a graduated cylinder c. measure at the bottom of the meniscus

3. B. Mass: do you know the: English unit for Mass? metric unit for mass? English unit for weight? metric unit for weight?

4. VariableEnglish unitMetric unit MassSlugGram (g)

5. VariableEnglish unitMetric unit MassSlugGram (g) WeightPoundNewton (N) N= 1kg x 1m/s 2 Force = Mass x Accel

6. VariableEnglish unitMetric unit MassSlugGram (g) WeightPoundNewton (N) N= 1kg x 1m/s 2 Force = Mass x Accel This means weight is a different measure than mass

7. VariableEnglish unitMetric unit MassSlugGram (g) WeightPoundNewton (N) N= 1kg x 1m/s 2 Force = Mass x Accel This means weight is a different measure than mass This also means that the Newton is a measure of two things: 1. weight (N) 2. force (F = M x A) (Isaac Newton lived during 1665 in London, during the plague)

8. 1. Mass -is a measure of the amount of matter in amu (atoms: # amu) of the object C. Weight 1. is a measure (in Newtons) of the mass of the object and 2. the amount of gravity (its force) acting on the object 3. are people on the moon really weightless?

9. D. weight (N) = mass x acceleration 1. so, how much does 1kg of mass weigh on Earth? 2. weight = 1kg x 9.8 m/s 2 3.so it is 9.8N, because the acceleration of gravity on Earth for all objects is 9.8m/s 2 and weight is always in Newtons: Galileo’s experiment! 4. if we were on the moon, would we weigh less or more, why?