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Friction
Term | Definition |
---|---|
Sliding Friction | Friction that occurs when one solid surface slides over another. Ex.: pushing a dresser across the floor. |
Rolling Friction | Friction that occurs when an object rolls across a surface. Ex.: roller skates |
Static Friction | Friction that acts on objects that are not moving. Ex.: pushing a heavy object that is not moving. |
Fluid Friction | Friction that occurs as an object moves through a fluid (a gas or liquid) Ex.: swimming or an airplane flying |
Speed | The total distance divided by the total time. S= d/t The rate of an object's movement. |
Velocity | The total distance divided by the total time and a direction. Objects traveling at the same speed but in different directions are traveling at different velocities. |
Force | A push or pull. |
Newton | The SI unit of force. |
Balanced Force | When an object is not moving. There is a net force of 0. |
Unbalanced Force | When an object is in motion. There is a net force greater than 0. |
Lubricant | Reduces friction of an object. |