3.1-3.6 ai Flashcards
What is the principle of moments?
The sum of the clockwise moments about any point is equal to the sum of the anticlockwise moments about that point.
This principle applies when an object is in equilibrium.
What is a moment of a force also known as?
Torque.
Torque is the rotational equivalent of linear force.
How is a moment calculated?
Moment of a force = force x perpendicular distance from the point.
This formula is used to determine the turning effect of a force about a specific point.
What unit is force measured in?
Newtons (N).
The newton is the SI unit of force.
What happens when an object is in equilibrium?
The anticlockwise moment about a point is equal to the clockwise moment.
This balance of moments ensures that there is no net turning effect.
Fill in the blank: The turning effect of a force is greater if you increase the _______ or use a longer spanner.
force.
A longer spanner allows for a greater perpendicular distance, enhancing the moment.
True or False: A large force at the end of a long spanner gives a small turning effect.
False.
A large force at the end of a long spanner produces a larger turning effect.
What can be said about the moments in diagram A when the bar is in equilibrium?
The bar is balanced, meaning the anticlockwise moments equal the clockwise moments.
This indicates a stable state with no net rotation.
What is the effect of a larger force applied at a longer distance from the pivot point?
It produces a larger turning effect.
This is due to the increased moment resulting from the calculation.
What is the total moment about point O if the anticlockwise moment is 10 N x 2 m?
20 N m.
This calculation represents the total turning effect about point O.
Calculate the moment about point O for a force of 3 N acting at a distance of 4 m.
12 N m.
This is calculated using the formula: Moment = Force x Distance.
In the context of moments, what does ‘taking moments’ refer to?
Calculating the moments about a point to analyze the forces acting.
This is essential for understanding equilibrium conditions.
What is a common practical example of using a longer spanner?
Tightening a nut.
A spanner increases the effective distance, making it easier to apply torque.
