1
lesson 3
I. Concepts and Definitions
H. Review of basic physics
1. Mass, force, and work
z
z = 1000 m
z = 0 m
A spherical, iron cannon ball of diameter
15.0 cm rests on the surface of the Earth
at elevation z = 0.00 m.
a) Calculate the mass (kg) of the ball.
b) Calculate the force (N) exerted by the
cannon ball on the surface.
c) Calculate the work (J and kJ) required
to raise the cannon ball 1000 m above
the surface of the earth (z = 1000 m).
lesson 3
I. Concepts and Definitions
H. Review of basic physics
1.
Mass
, force, and work
a. Mass of ball
From Table A3, the density of iron,
ρ
, is 7840
kg/m
3
.
The diameter, D, is 0.15 m.
The mass, m,
is the product of density and volume.
kg
85
.
13
2
m
15
.
0
3
4
m
kg
7840
2
D
3
4
)
Vol
(
m
3
3
3
=
⎟
⎠
⎞
⎜
⎝
⎛
=
⎟
⎠
⎞
⎜
⎝
⎛
=
=
π
ρ
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lesson 3
I. Concepts and Definitions
H. Review of basic physics
1. Mass,
force
, and work
b. Force exerted by ball on surface
The standard acceleration of gravity,
g
, from the
inside front cover of the text, is 9.81 m/s
2
.
Newton's
second law, Equation 11, p. 6 of the text, defines
the force.
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 Summer '08
 thermo
 pH, Energy, Kinetic Energy, Basic physics, Esystem, I. Concepts, H. Review

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