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Which is not a characteristic of friction?
Friction acts parallel to the surfaces in contact.
Friction acts opposite the direction of the motion.
Friction depends upon the type of surfaces in contact.
Friction depends upon the surface area in contact.
The force exerted by a surface to support an object is the _______.
Newton's _____ Law states that for every action there is an equal, but opposite reaction.
Universal Law of Gravitation
The unit of force is the _____.
An object is in equilibrium when
there is a net force
there is an applied force
the net force is zero
the object is accelerating
An object rests on a horizontal surface. What is the relationship between the object's weight and the normal force?
They are equal.
The weight of the object is greater.
The weight of the object is less.
There is no relationship.
If the sum of all the horizontal forces acting on an object is zero, the object is in equilibrium.
If the sum of all the horizontal forces is zero and the sum of all the vertical forces is zero, the object is in equilibrium.