Directions: Use the words in the word box to complete the following sentences. acceleration
gravity
counteract
resistance
balanced
force
When the forces acting on an object are , there is no change in the object's motion.
A acting on a resting object can cause the object to move.
On Earth, pulls all objects toward the ground.
When a force acts in the opposite direction of another force, the forces each other.
More than one force acting on a falling object can reduce its downward .
Air is caused by molecules of air pushing against a moving object.