Simple Machines , Tools used to make work easier, Work, A force acting on an object to move it across a distance, Force, Any push or pull that causes an object to change its position, direction, or shape, Simple Harmonic Motion, An object moving in a non-complex periodic way, Pendulum, A body suspended from a fixed point so that it can swing back and forth under the influence of gravity. under the influence of gravity, Gravity, The attraction between two masses, such as the earth and an object on its surface, Friction, The force that resists motion through the rubbing of one object against another.

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