Moments 01

1. Moments (turning forces) depend on .......

   • force and distance from the pivot
   • force and mass
   • force and weight
   • mass and distance from the pivot

2. The moment will be increased .......

   • if the force and distance from the pivot are decreased
   • if the force and distance from the pivot are increased
   • if the force is decreased and distance is increased
   • if the force is increased and distance is decreased

3. Jane weighs 400N. She sits on a see-saw 1.5m from the pivot (centre). Calculate the moment caused by Jane.

   • 200Nm
   • 400Nm
   • 600Nm
   • 800Nm

4. Amir weighs 500N. He sits on a see-saw 200cm from the pivot (centre). Calculate the moment caused by Amir.

   • 200Nm
   • 700Nm
   • 1,000Nm
   • 10,000Nm

5. Two children weigh 300N and 400N, they sit 2m and 3m away from the pivot (centre) on the same side of the see-saw. What is their total moment?

   • 1,700Nm
   • 1,800Nm
   • 2,200Nm
   • 3,500Nm

6. A friend joins the two children (Q5) and sits on the other end of the see-saw. He weighs 600N. How far from the pivot must he sit to balance the see-saw?

   • 2m
   • 2.5m
   • 3m
   • 5m

7. A spanner is 20cm long. A force of 10N is applied to undo a bolt. What is the moment (turning force)?

   • 2Nm
   • 20Nm
   • 200Nm
   • 2,000Nm

8. A 40cm spanner is used to produce the same turning force as Q7. What force would be needed?

   • Double the force
   • Quarter of the force
   • Half the force
   • The same force

9. A moment of 50Nm is needed to open a jar. The pliers are 10cm long. What force is needed?

   • 5N
   • 50N
   • 100N
   • 500N

10. A moment of 80Nm is needed to undo a wheel nut. The spanner is 20cm long. What force is needed?

    • 4N
    • 80N
    • 400N
    • 800N

Quiz written by Sue Davison