A
air resistance 17
avalanche 10, 11, 12
B
boulder 18
C
cold 6, 16
compass 20
D
dark 14, 22, 24
direction 7, 17
distance 19, 22, 23
E
Earth 21
effort 12, 13
F
fall 9, 11, 22
flat 6, 16
fog 20, 22
force 7, 9, 11, 13, 17, 19
friction 11, 14, 15
fulcrum 12, 13
G
gravity 9, 11
J
jump 8
K
keys 18, 20
L
lever 12, 13
lift 12, 13, 14
load 12, 13
M
magnet 18, 19, 20, 21
P
pole 21
pull 7, 9, 13, 14, 19
push 6, 7, 13, 17, 25
R
rock 12
rocket 24
rough 14, 15
S
sail 16, 17, 18
shape 8, 9
size 8, 9, 16
sled 14, 18
slide 10, 14
slope 6
smooth 14, 15
snowboard 6, 8, 14
speed 7, 23
spin 8
surface area 17
T
thrust 25
time 22, 23
tree 12, 14
turn 12, 13
W
weight 9, 10, 11
wind 16, 18
INDEX
30
