Two children are on a seesaw. Child A (400 N) sits 1.5 m from the pivot. Calculate the moment created by Child A.
Moment = 400 N Ã 1.5 m = 600 Nm (anticlockwise)
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15
Explain what is meant by the perpendicular distance
distance between the pivot and the line of action of the force
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15
Calculate the unknown force F2 given that the system is in equilibrium
F2 = 6 N
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15
What are the factors that affect the size of a moment?
force and the perpendicular distance
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15
Two children are on a seesaw. Child A (400 N) sits 1.5 m from the pivot. Child B (300 N) sitting on the other side. How far must Child B sit from the pivot for the seesaw to be equilibirum?
Moment A = Moment B. 600 Nm = 300 N Ã d; d = 600 Nm / 300 N = 2m
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15
A see-saw is balanced. Sarah (weight 350 N) sits 2 m from the pivot. David sits 2.5 m from the pivot on the other side. What is David's weight?
Moment Sarah = Moment David. (350 N à 2 m) = (Weight_David à 2.5 m); Weight_David = 700 Nm / 2.5 m = 280 N
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15
A force of 10 N is applied perpendicularly to a door at a distance of 0.5 m from the hinges. Calculate the moment.
Moment = 10 N Ã 0.5 m = 5 Nm
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15
A mechanic applies a force of 100 N perpendicular to a 0.5 m long wrench. What is the moment?
Moment = 100 N Ã 0.5 m = 50 Nm
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15
A door is 0.8 m wide. If you push at the very edge with a force of 20 N perpendicular to the door, what is the moment about the hinges
Moment = 20 N Ã 0.8 m = 16 Nm
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15
To turn a nut, a moment of 15 Nm is needed. What force must be applied at the end of a 0.3 m long spanner?
Force = Moment / Distance = 15 Nm / 0.3 m = 50 N
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15
A mechanic applies a force of 100 N perpendicular to a 0.5 m long wrench. If the mechanic used another 1 m long wrench, what force would be needed to create the same moment like 0.5 m wrench?
Moment / Distance = 50 Nm / 1 m = 50 N
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15
Look at the picture below! Prove whether this system is in equilibrium or not! How many is M1 & M2?
