# Moments

e.g. Two children sit on seesaw. Adult balances  seesaw at one end. Find size + direction of force that adult needs to apply.

#400N------1.5m--------#-----1m-----300N-----------0.5m---#

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The moment, or torque, of a force depends on the size of the force and how far the force is applied from the turning point... M=fd
Moment of a force (in Nm) is equal to the force (in N) multiplied by the perpendicular sitance between the line of action of the force and the pivot (in m)
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e.g. Two children sit on seesaw. Adult balances seesaw at one end. Find size + direction of force that adult needs to apply. #400N------1.5m--------#-----1m-----300N-----------0.5m---#
In equilibrium, + anticlockwise moments=+clockwise moments 400x1.5=(300x1)+1.5F...600=300+1.5F...F=(600-300)/1.5=200N downwards
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What is a moment?
The turning effect of a force around a turning point
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A couple is a pair of forces of equal size which act parallel to each other, but in opposite directions. The size of this torque depends on the size of the forces and the distance between them. What is the equation?
T = F x d Torque of a couple (in Nm) is equal to the size of the forces (in N) multiplied by the perpendicular distance between the forces (in m)
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e.g. A cyclist turns a shap right corner by applying equal but opposite forces of 20N to ends of handlebars. Length of handlebars is 0.6m. Calculate torque applied to handlebars. !20N-----------^0.6m^-------------20Ni
torque = size of forces x perpendicular distance bew
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## Other cards in this set

### Card 2

#### Front

e.g. Two children sit on seesaw. Adult balances seesaw at one end. Find size + direction of force that adult needs to apply. #400N------1.5m--------#-----1m-----300N-----------0.5m---#

#### Back

In equilibrium, + anticlockwise moments=+clockwise moments 400x1.5=(300x1)+1.5F...600=300+1.5F...F=(600-300)/1.5=200N downwards

### Card 3

#### Front

What is a moment?

### Card 4

#### Front

A couple is a pair of forces of equal size which act parallel to each other, but in opposite directions. The size of this torque depends on the size of the forces and the distance between them. What is the equation?

### Card 5

#### Front

e.g. A cyclist turns a shap right corner by applying equal but opposite forces of 20N to ends of handlebars. Length of handlebars is 0.6m. Calculate torque applied to handlebars. !20N-----------^0.6m^-------------20Ni