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13 ‐ Γενική Μηχανική ‐ 4 ‐ Ενέργεια και Έργο
15/9/2014
© Κωνσταντίνος Χ. Παύλου (ΓΕΛ Μεσοποταμίας)
22
Διατήρηση της ενέργειας
15‐Σεπ‐14
(c)
Κωνσταντίνος Χ. Παύλου
43
m = 10 kg
h = 2 m
υ = 0
U = mgh = 200 J
K = 0,5m
υ
2
= 0
U = mgh =
0
K = 0,5m
υ
2
= 200
J
U = mgh = 130 J
K = 0,5m
υ
2
=
70 J
Ε
Κ
U
50
100
150
200
J
200
200
Ε
Κ
U
50
100
150
200
J
200
130
70
Ε
Κ
U
50
100
150
200
J
200
200
Παράδειγμα…
15‐Σεπ‐14
(c)
Κωνσταντίνος Χ. Παύλου
44
b) h=a
a) h<a
e) h>c
d) h=c
c) h=b
A box slides along a frictionless surface, as shown in the figure. It is released from rest at the
position shown. What is the highest point
h
that the box reaches on the other side?