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1)
a. You will land back on the same spot from
which you jumped.
b. You will land back on the same spot on the
plane from which you jumped.
c. In both cases no unbalanced horizontal
forces were acting on you; therefore, you
maintain your current horizontal motion (at
rest in a. and moving at 300 mi/hr in b.)
while accelerating vertically due to the force
of gravity.
2)
When the Ping-Pong ball and the bowling ball
collide they exert equal forces on each other in
opposite directions (3rd Law). The Ping-Pong ball
undergoes a much larger acceleration than
bowling ball does because its mass is so much
smaller. (2nd Law)


FB  P   FP  B

(m ) ( a )  ( m )
B
P
P

( aB )
3)
Assuming you are trying to accelerate both
objects equally, the tank has a greater mass and
will require a larger retarding force in order to
experience that acceleration. (2nd Law)


aT  a J

F
m

F

m
4)
The blades are angled; as they move through
the air they push air particles in one direction.
Each air particle applies an equal and
oppositely directed reaction force to the blade,
causing it to move in the opposite direction.
(3rd Law)
5)
The dog is using Newton’s 1st Law to remove
the water from his fur. The dog shifts his body
in one direction, causing his fur and the water
in it to begin moving. Then he quickly stops his
fur by applying an unbalanced force to it. No
such force acts on the water drops so they
continue moving in the original direction,
leaving his fur. Repeating this several times
removes most of the water.
6)
The water comes up through the middle of the
sprinkler and travels out each arm. The bend in
the arm forces the water in one direction, and
each water particle applies an equal reaction
force to the sprinkler arm in the opposite
direction. (3rd Law)