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Mechanical Force

Mechanical Force. Scalars—only magnitude. I. Newton’s First Law of Motion—every object will remain at rest, or will continue to move in a straight line with constant speed, unless the object is acted on by a net force.

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Mechanical Force

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  1. Mechanical Force

  2. Scalars—only magnitude

  3. I. Newton’s First Law of Motion—every object will remain at rest, or will continue to move in a straight line with constant speed, unless the object is acted on by a net force.

  4. II. If two or more forces act in the same direction, add their magnitudes to get the net force. The direction of the net force is the same as the direction of the added forces.

  5. III. If two forces act in opposite directions, subtract their magnitudes to get the net force. The direction of the net force is the same as the direction of the larger force.

  6. If forces don’t act along the same line, you can solve the problem graphically.A. Draw and label the forces.B. Use A2 + B2 = C2C. Use a protractor to measure the angle that C makes with the horizontal.

  7. Weight vs. MassA. Mass is how much matter a substance containsB. Weight is mass times gravity

  8. Torque and RotationA. Torque--force that causes rotation in mechanical systemsB. Line of Rotation—line along the applied force that extends in both directions

  9. Torque = applied force x lever arm • τ = FxL • units--ft·lb or N·m

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