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Questions and Answers
What is equilibrium?
Equilibrium is a state of stability where an object is either at rest or moving at a constant speed.
What is the resultant force?
The resultant force is a single force that has the same effect in magnitude and direction as multiple forces acting together.
What is equilibrant force?
An equilibrant force is a single force that balances all other forces together.
An object can be in equilibrium if it is rotating at a constant angular velocity.
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What is the moment of a force defined as?
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The algebraic sum of moments about a point is calculated by considering the ________ moment as positive.
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In the example provided, what distance must the 15N force hang to balance the ruler horizontally?
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What is the weight of the ruler if it balances at the 55cm mark with a mass of 40g hung from the 95cm mark?
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What is a couple in terms of forces?
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What defines the centre of gravity of a body?
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Study Notes
Equilibrium
- A state of stability where a body remains at rest or moves in a straight line at a constant speed.
- Characterized by no rotation or constant angular velocity – dynamic equilibrium.
Resultant Force
- A single force that replaces the combined effect of multiple forces acting together.
- Calculated using the parallelogram law of vectors.
Equilibrant Force
- A single force that balances the effect of all other forces acting on a body.
- Equal in magnitude but opposite in direction to the resultant force.
Moment of a Force
- The turning effect of a force.
- Calculated by multiplying the force by the perpendicular distance from the point of rotation to the line of action of the force.
- Moment = Force x perpendicular distance = Fd
- For multiple forces, the resultant moment is the algebraic sum of individual moments.
- Clockwise moments are conventionally positive.
- Anticlockwise moments are conventionally negative.
Centre of Gravity
- The point where the resultant weight of a body appears to act.
- Located at the center of a uniform symmetrical body.
- The centre of gravity of a uniform symmetry body is at the centre of the body.
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Description
This quiz covers key concepts related to equilibrium, resultant forces, equilibrant forces, moments of forces, and the center of gravity. Test your understanding of how forces interact and affect motion in a stable environment. Ideal for students studying physics concepts in depth.
