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Work, Force, Motion
7.7C Work, Force, & Motion
Term | Definition |
---|---|
Work | The use of force to move an object through a distance; calculated as force times distance. |
Force | A push or pull that can change the motion of an object. |
Net Force | The sum of all the forces acting on an object. |
Motion | The change in an object's position with respect to time and in comparison to the position of other objects used as reference points. |
Friction | Force that opposes the sliding motion between two touching surfaces. |
Simple Machines | Devices that reduce the amount of force needed, but do not reduce the amount of work being done. |
Distance | The length of a path between two points. |
Incline Plane (Ramp) | Simple machine that is sloping at a particular angle. |
Wedge | Simple machine made of 2 back-to-back inclined planes and that moves; often used for cutting. |
Pulley | Simple machine made of grooved wheel with a rope or cable wrapped around it. |
Screw | Simple machine made of Inclined plane wrapped around a cylinder. |
Lever | Simple machine that consists of a bar that pivots at a fixed point called a fulcrum. |
Wheel-and-Axle | Simple machine made from two different-sized, circular objects that are connected and rotate together. |