Podcast
Questions and Answers
What is the moment of a force calculated from?
What is the moment of a force calculated from?
Which scenario maximizes the turning effect when using a crowbar?
Which scenario maximizes the turning effect when using a crowbar?
To achieve balance on a see-saw, what must be true about the moments on either side?
To achieve balance on a see-saw, what must be true about the moments on either side?
Which of the following statements about the distance from the pivot is true?
Which of the following statements about the distance from the pivot is true?
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If a father is pushing on a see-saw at half the distance from the pivot, how does that affect the force he needs to apply?
If a father is pushing on a see-saw at half the distance from the pivot, how does that affect the force he needs to apply?
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Study Notes
Moments
- Moment is the turning effect of a force
- Moment is calculated by multiplying force by the perpendicular distance from the pivot
- A bigger force creates a bigger moment
- A greater distance from the pivot creates a bigger moment
- Moment is greatest when the force is perpendicular to the object
Balancing a Beam
- A beam is balanced when the sum of the clockwise moments equals the sum of the anticlockwise moments
- If the clockwise moments are greater than the anticlockwise moments, the beam will tip clockwise
- Increasing the force on a beam or increasing the distance from the pivot increases the moment
- To balance a beam with unequal weights, the greater weight must be closer to the pivot or the smaller weight must be further from the pivot, or both.
Opening a Door
- To open a door, apply a force as far from the pivot (hinge) as possible
- The force must be perpendicular to the door
Making use of turning effects
- Crowbars utilize a large turning effect by applying force close to the end of the bar. For greater effect force must be at 90 degrees to the beam.
- Wheelbarrows use long handles to increase the moment of the lifting force.
Equilibrium
- Equilibrium occurs when the resultant force and the resultant moment are both zero.
- To achieve equilibrium, the sum of all clockwise moments equals the sum of all counterclockwise moments, and all forces are balanced.
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Description
This quiz covers the essential concepts of moments in physics, including the calculation of moments using force and distance from the pivot. You'll learn how balancing a beam works and the principles behind opening a door effectively using turning effects. Test your understanding of these important physical principles.
