Resultant forces

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6 Terms

1
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Resultant force

a single force that has the same effect as all the other forces acting on an object

2
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How to draw a free-body diagram?

Draw all forces from the centre of the object

<p>Draw all forces from the centre of the object</p>
3
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How to find the FR?

If single forces, subtract adjacent forces

If multiple, add forces in the same direction and subtract from forces on the other direction

<p>If single forces, subtract adjacent forces</p><p>If multiple, add forces in the same direction and subtract from forces on the other direction</p>
4
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Newton’s first law

If forces acting on an object are balanced, the resultant force is 0

  • if the object is at rest, it remains stationary

  • if it is moving, it will continue moving at the same speed in the same direction

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Resultant force can…

  1. Start motion

  2. Stop motion

  3. Speed up motion

  4. Slow down motion

  5. Change direction

  6. Change shape

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What is the effect of a resultant force called?

acceleration