Moments
- Created by: Sophie
- Created on: 04-05-13 10:50
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- Turning Forces and the Centre of Mass
- A moment is the turning effect of a force
- Moment= force x perpendicular distance from line of action to pivot
- E.g spanner
- Force on spanner causes turning effect on the nut (pivot).
- A larger force means a larger moment
- Longer spanner
- Same force can exert a larger moment bacause the perpendicular distance from the pivot is larger
- To get the maximum moment you need to push at right angles (perpendicular) to the spanner
- Centre of mass
- Hangs directly below point of suspension
- Centre of mass= the point at which the whole mass is concentrated
- Suspend a shape and plumb line from the same point and wait until the stop moving
- Draw a line along the plumb line
- Do the same thing again, but suspend the shape from a different pivot point
- The centre of mass is where your two lines cross
- Do the same thing again, but suspend the shape from a different pivot point
- Draw a line along the plumb line
- In symmetircal shapes you can guess by looking for lines of symmetry
- The object's weight acts at a distance from the pivot, which creates a moment about the pivot
- This makes is swing until the centre of mass is at its lowest
- It rests in this position because there is no moment- the pivot is in line with the line of action of the force
- This makes is swing until the centre of mass is at its lowest
- A moment is the turning effect of a force
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