Question 18
Original source text (the original panel preserves all diagram labels, tables and choices):
A “balloon racer” is a fun simple toy. It is made by taping an inflated balloon firmly
to a toy car, as shown below. After removing the plug of the balloon, air rushes
out of the balloon, producing a force.
Air
pushed out
Moving
directionX
The force caused the balloon and the toy car to move in direction X because this
force was greater than the ___________________.
A. Weight of the toy car and the balloon.
B. Weight of the toy car and the wheels.
C. Friction between the balloon and the toy car.
D. Friction between the wheels and the ground.
A “balloon racer” is a fun simple toy. It is made by taping an inflated balloon firmly
to a toy car, as shown below. After removing the plug of the balloon, air rushes
out of the balloon, producing a force.
Air
pushed out
Moving
directionX
The force caused the balloon and the toy car to move in direction X because this
force was greater than the ___________________.
A. Weight of the toy car and the balloon.
B. Weight of the toy car and the wheels.
C. Friction between the balloon and the toy car.
D. Friction between the wheels and the ground.