Lecture: Volume, Weight and Mass

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 = m3 (what dimension/why?)b. irregular shape : water displacement: ?

unit is the Liter: why?how do you convert m3 to Liters, what’s the conversion formula?

2. liquids:a. unit is the literb. use a graduated cylinderc. measure at the bottom of the meniscus

B. Mass:do you know the:

English unit for Mass?

metric unit for mass?

English unit for weight?

metric unit for weight?

Variable English unit Metric unit

Mass Slug Gram (g)

Variable English unit Metric unit

Mass Slug Gram (g)

Weight Pound Newton (N)

N= 1kg x 1m/s2

Force = Mass x Accel

Variable English unit Metric unit

Mass Slug Gram (g)

Weight Pound Newton (N)

N= 1kg x 1m/s2

Force = Mass x Accel

This means weight is a different measure than mass

Variable English unit Metric unit

Mass Slug Gram (g)

Weight Pound Newton (N)

N= 1kg x 1m/s2

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)

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?

D. weight (N) = mass x acceleration1. so, how much does 1kg of mass weigh on Earth?2. weight = 1kg x 9.8 m/s2

3.so it is 9.8N, because the acceleration of gravity on Earth for

all objects is 9.8m/s2 and weight is always in Newtons:

Galileo’s experiment!4. if we were on the moon, would we weigh less or more, why?