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# Chapter 5 (Newton's 3rd Law)

Name_________________

Date __________________
Across
The ______force always acts on the ACTION force.
The same force exerted on a _____ mass produces a large acceleration.
A force interaction requires at least a ____ of forces.
The force that directly propels a motor scooter along a highway is that provided by the _____.
Airplanes fly because slightly tilted wings of an airplane ______ oncoming air downward and produce lift.
Action and reaction forces act on _______ objects.
A system undergoes acceleration only when acted on by a ____ force.
If two kicks on the ball are __________, equal, and opposite, then the net force on the ball is zero.
When the force pair is internal to a system, the forces will ______each other.
When a bird is soaring, the shape of its ______ deflects air downward.
Down
are equal in strength and ________ in direction.
When a cannon is fired, the accelerations of the cannon and cannonball are different because the _____ are different.
Whenever one object exerts a force on a second object, the second object exerts a force on the first that is opposite in direction and equal in _______ at the same time.
An _____ is between one thing and another. requires a pair of forces acting on two objects.
The upward force of a helicopter pushing against the ______force of air is called the
Newton's _____ Law states that "Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first.
When lift equals the weight of the craft, the helicopter _____ in midair.
The same force exerted on a ____ mass produces a small acceleration.