The force two surfaces exert on each other when they rub against each other is the contact force called ____ Friction acts in a direction ____ the object's motion. When an object rolls across a surface, ____ friction occurs. When two solid surfaces slide across each other, ____ friction occurs. ____ friction acts on objects when they are resting on a surface. ____ friction occurs when a solid object moves through a fluid, such as air or ____. Gravity is an example of a ____ force. Gravity is a force that ____ objects toward each other. The ____ states that the force of gravity acts between all objects in the universe that have mass. Any two objects in the universe that have mass ____ each other. The factors that control the strength of the gravitational force between two objects are the ____ of each object and the ____ between them. As distance ____, gravitational force ____. ____ is a measure of the amount of matter in an object. ____ is a measure of the force of gravity on object. Since weight is a measure of force, the SI (International System of Units) unit of weight is ____. Force is measured in ____. Acceleration is measured in ____. Mass is measured in ____. On earth, 1 pound equals ____.

Friction and Gravitational Interactions

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