Moments

9.A seesaw is balanced with a 15 N weight 0.4 m from the pivot on one side. On the other side, a weight of 10 N is placed. How far from the pivot must the 10 N weight be to balance the seesaw?

10.A 50 N force is applied at a distance of 0.3 m from a pivot, producing a moment. If the force is reduced to 25 N, what distance is needed to produce the same moment?

11.Which of the following statements about moments is true?

12.What is the unit of force used in the moment equation?

13.A force of 40 N is applied at a perpendicular distance of 0.25 m from a pivot. What is the moment?

14.A spanner is used to turn a nut. The force applied is 50 N at a distance of 0.4 m from the nut. What is the moment?

15.A 30 N weight is placed 0.6 m from the pivot on the left side of a seesaw. On the right side, a 20 N weight is placed 0.9 m from the pivot. Is the seesaw balanced?

16.A seesaw has a 25 N weight 0.8 m from the pivot on the left. On the right, a 40 N weight is placed. How far from the pivot must the 40 N weight be for the seesaw to balance?

17.What is the turning effect of a force called?

18.A force of 12 N is applied at a distance of 0.5 m from a pivot. What is the moment?

19.A mechanic uses a spanner of length 0.3 m to apply a force of 60 N to a bolt. What is the moment?

20.A seesaw is balanced with a 50 N weight 0.4 m from the pivot on one side. On the other side, a 20 N weight is placed. How far from the pivot must the 20 N weight be to balance?

21.A force of 100 N produces a moment of 25 Nm. What is the perpendicular distance from the pivot?

22.A 15 N weight is 0.8 m from the pivot on the left of a seesaw. A 12 N weight is 1.0 m from the pivot on the right. Which statement is correct?

23.What is the unit of moment?

24.A force of 8 N is applied at a distance of 0.75 m from a pivot. What is the moment?

25.A student uses a spring balance to measure the force needed to lift a load using a lever. The load of 5 N is placed 0.2 m from the pivot, and the spring balance is attached 0.5 m from the pivot on the other side. What is the reading on the spring balance when the lever is balanced?

26.In an experiment to verify the principle of moments, a student places a metre rule on a pivot at its centre. She hangs a 1.0 N weight at the 10 cm mark and a 2.0 N weight at the 40 cm mark on the same side of the pivot. To balance the rule, she hangs a 3.0 N weight on the other side. At what mark should the 3.0 N weight be placed?

27.Which of the following is the correct definition of a moment?

28.What is the moment when a force of 10 N is applied at a perpendicular distance of 0.5 m from the pivot?

29.A see-saw is balanced with a 30 N child sitting 1.5 m from the pivot on one side. On the other side, a 20 N child sits at a distance of 2.0 m from the pivot. Which child produces the larger moment?

30.A student investigates the relationship between force and distance for a lever. She applies a force of 5 N at a distance of 0.4 m from the pivot and measures the moment. She then applies a force of 10 N at a distance of 0.2 m from the pivot. What is the ratio of the first moment to the second moment?

31.In a practical activity, students use a metre rule and a pivot to find the weight of an unknown object. They balance the rule with a known 2 N weight at 30 cm from the pivot, and the unknown weight at 15 cm from the pivot on the other side. What is the unknown weight?

32.What is the unit of a moment?

33.A spanner is used to turn a nut. The force applied is 40 N at a perpendicular distance of 0.15 m from the nut. What is the moment?

34.A uniform metre rule is balanced on a pivot at its centre. A 0.5 N weight is hung at the 10 cm mark. A 1.0 N weight is hung at the 70 cm mark. Is the rule balanced? If not, which side will drop?

35.What is a moment?

36.What does the 'distance' in the equation Moment = Force × Distance represent?

37.A spanner is used as a force-multiplier. What does this mean?

38.A force of 30 N is applied at a distance of 0.2 m from a pivot. What force would be needed if the distance is increased to 0.6 m to produce the same moment?

39.The distance in the moment equation is the perpendicular distance from the pivot to the line of action of the force.

40.Which of the following are units used in the moment equation? (Select all that apply)

41.A spanner acts as a force-multiplier because applying a force at a greater distance from the pivot reduces the force needed to turn the bolt.

42.Match each quantity to its correct unit.

43.Arrange the following steps in the correct order to determine if a seesaw is balanced.

44.If the clockwise moment is 8 Nm and the anticlockwise moment is 7 Nm, the seesaw is balanced.

45.A force of 5 N is applied at a perpendicular distance of 0.3 m from a pivot. What is the moment?

46.Which of the following are correct about a spanner being used as a force-multiplier? (Select all that apply)

47.A student uses a spanner to turn a bolt. She applies a force of 40 N at a distance of 0.15 m from the centre of the bolt. What is the moment applied to the bolt?

48.Complete the sentence.

49.State the principle of moments.

50.A spanner applies a moment of 12 Nm to a bolt. The force applied is 40 N. What is the perpendicular distance from the pivot?

51.A seesaw is balanced. On the left side, a 30 N weight is placed 0.8 m from the pivot. On the right side, a 20 N weight is placed. How far from the pivot must the 20 N weight be for the seesaw to balance?

52.Explain why a longer spanner makes it easier to turn a bolt.

53.A spanner applies a moment of 12 Nm to a bolt. The force applied is 40 N. What is the perpendicular distance from the pivot?

54.A seesaw is balanced. On the left side, a 30 N weight is placed 0.8 m from the pivot. On the right side, a 20 N weight is placed. How far from the pivot must the 20 N weight be for the seesaw to balance?