action & reaction
A force ____ acts on itself.
Never
Equal forces acting in opposite directions causing no change in motion.
balanced force
This law states that for every force that object A applies on B, object B pushes the same amount of force back, but in the opposite direct, of object A.
Newton's Third Law
At least ___ objects must be involved.
Two
Forces not equal in size that cause the motion or direction of an object to change.
unbalanced force
A force that opposes the motion of objects that touch as they move past each other.
Friction
For every ________ there is an equal and opposite _____________.
Action, reaction
If someone is pushing with 50N of force to the right and the other person is pushing with 10N of force to the left, which way will the box go?
To the right
The tendency of an object to resist any change in motion.
Inertia
Gravity and magnetism are examples of what kind of forces?
non-contact
If an object is in motion, what is needed to change the motion?
an outside force
The sum of all forces acing on an object.
Net force
Forces can occur even without friction. True / False
True
If a ball is rolling across a table with 10 N of force and experiences 10 N of friction what is the motion of the object?
Constant motion
Newton's law states that all forces come in...
pairs