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Work, Force, Motion

7.7C Work, Force, & Motion

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.