Required information An ergonomically designed key for a computer keyboard has an approximately flat surface defined by points A, B, and C and is subjected to a 1 N force in the direction normal to the key's surface. In the figure, the switch mechanism is repositioned so that the motion of the key is in the direction of the line connecting points D and E, where this line has x-, y-, and z-direction cosines of 0.123, 0.123, and 0.985, respectively. Determine the components of the force in directions normal and tangent to the key's motion. (Round the final answers to four decimal places. Include a minus sign if necessary.) A (15,0, 10) mm z B (0, 0, 15) mm C (0, 15, 12) mm A D B E y The component of force in the direction tangential to the motion is The component of force in the direction normal to the motion is N. N.

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Free Body Diagram

The system of forces acting on a body tends to either rotate it or make the body undergo motion. In general, when an external agent exerts a force on a body, the body undergoes translational motion and rotational motion. The body has six degrees of freedom under the influence of that force. Here, three degrees of freedom are from the translational motion while the other three are from the rotation motion. However, sometimes the bodies are not allowed to undergo any motion and are fixed, under such conditions the body is said to be constrained.