Y06 ch6
1
Work (
Ch. 6)
Main ideas and results:
•
Work of a
constant force
F
along a
straight path
W
=
F
·
s
=
F s
cos
θ
SI unit:
1
joule;
Sign of work
; work of
sum of forces
equals sum of
works
W
F
1
+
F
2
=
W
F
1
+
W
F
2
•
Work along a curve
C
:
W
=
W
C
F
=
Z
C
F
·
d
l
=
Z
C
F
·
d
s
=
Z
C
F
cos
θ
ds,
If the path
C
is split into two parts,
C
1
and
C
2
, then
W
C
F
=
W
C
1
F
+
W
C
2
F
•
Work-energy theorem
(for motion under the force
F
):
work equals to change in kinetic energy
W
F
=
K
2
−
K
1
,
where, for a point mass, its
kinetic energy
is
K
=
1
2
mv
2
.

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