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5 Turning forces: 5.2 Some simple examples of moment calculations

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Index of physics notes: 5. Turning forces, calculating moments, problem solving


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5.2 Some simple moment calculations using the moment formula

Q1

Calculate the moment if a force of 5.0 N is applied to a spanner 15 cm long.

Worked out ANSWERS

 

Q2 A force of 20 N is applied to a door causing a moment of 5 Nm.

Calculate the distance in cm from the hinge axle to the point on the door where the force was applied.

Worked out ANSWERS

 

Q3 What force must applied to a 30 cm long spanner to generate a moment of 6.0 Nm?

Worked out ANSWERS

 

Index of Forces 5. Turning forces, calculating moments, problem solving


Keywords, phrases and learning objectives for turning forces

Know the formula for calculating a moment and be able to do simple moment calculations.


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Index Forces 5. Turning forces, calculating moments, problem solving

Worked out ANSWERS to the moment calculations

Q1

Calculate the moment if a force of 5.0 N is applied to a spanner 15 cm long.

F = 5, d = 15/100 = 0.15 m

moment M = F x d = 5 x 0.15 = 0.75 Nm

 

Q2 A force of 20 N is applied to a door causing a moment of 5 Nm.

Calculate the distance in cm from the hinge axle to the point on the door where the force was applied.

moment M = F x d, so d = M/F = 5/20 = 0.25 m,

therefore d = 0.25 x 100 = 25 cm

 

Q3 What force must applied to a 30 cm long spanner to generate a moment of 6.0 Nm?

moment M = F x d, so F = M/d, d = 30 cm = 30/100 = 0.30 m

F = M/d = 6.0/0.30 = 20 N

 

Index Forces 5. Turning forces, calculating moments, problem solving

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