The difference between weight and mass.

1. You DON’T weight
what your weight scale tells you
98 kg
LIAR !
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2. What your weight scale gives you is not
your weight, is your MASS
98 kg
mass is measured in
kilograms (kg)
WEIGHT SCALE MASS SCALE

3. To measure your weight you should use a
DYNAMOMETER
weight is measured in
Newtons (N) 960 N

4. Weight and mass are RELATED but are not
the same thing
W = mxg
weight (N)
mass (kg)
gravity
acceleration
(m/s2)

5. Mass is a measure of the amount of
MATTER in a body
matter has mass and occupies space

6. Mass is an INTRINSIC characteristic of the
body
m = 98 kg m = 98 kg
mass doesn’t depend on the circumstances of the body

7. Weight is a gravitational FORCE exerted
by a near planet or star
W = 960 N W = 160 N
Planets with more mass attract with greater forces

8. Weight is a VECTORIAL QUANTITY
- has a magnitude (N) and a direction

9. When g changes, W also changes
m = 0,1 Kgg = 1,6 m/s2
g = 9,8 m/s2
W = 0,1 x 1,6 = 0,16 N
W = 0,1 x 9,8 = 0,98 N

10. On Earth, your weight of 960 N is the
weight of a body with a 98 kg mass
98 kg
Don’t worry, under
100 kg is all right
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