FORCES
CONTACT
NONCONTACT
BALANCED
GRAVITY
FRICTION
ELECTRICITY
MAGNETISM
ELECTROMAGNETIC
PUSH
PULL
R
Y
U
I
C
U
O
G
D
Y
E
N
J
B
O
E
U
A
H
U
N
C
R
M
Q
L
P
Y
A
U
O
A
R
O
A
V
P
A
O
P
E
B
Y
L
L
I
F
O
R
C
E
S
V
D
A
C
K
Y
A
U
N
E
L
E
C
T
R
I
C
I
T
Y
M
N
V
M
G
A
C
N
J
P
T
R
T
R
J
O
C
G
C
A
A
M
O
U
A
Y
C
O
O
Q
S
E
X
Z
C
G
Y
I
N
D
A
I
O
M
V
Z
D
H
O
L
A
N
I
O
T
K
H
D
A
Y
P
S
K
J
K
U
B
E
N
O
A
W
T
G
O
U
E
O
U
R
A
D
O
T
G
S
C
H
N
P
O
C
A
S
I
E
C
L
F
I
T
O
T
E
I
U
Y
Q
P
Z
N
E
O
U
V
S
E
N
T
X
X
L
Q
U
O
O
W
D
F
A
E
M
E
I
U
F
E
L
N
I
G
U
O
L
E
F
R
I
C
T
I
O
N
