Moments and levers

Question 1

On a seesaw, a child weighing 300 N sits 1.5 m from the pivot. How heavy must a second child sitting 3 m on the other side be to balance it, in N?

Answer N

Question 2

What is the pivot of a lever?

• A. the point it turns around (the fulcrum)
• B. the heaviest end
• C. the load
• D. the force you apply

Question 3

A force of 10 N is applied 2 m from a pivot, at right angles. What is the moment, in N m?

Answer Nm

Question 4

On a seesaw, a child weighing 300 N sits 1.5 m from the pivot. How heavy must a second child sitting 3 m on the other side be to balance it, in N?

Answer N

Question 5

Why does a long spanner (wrench) make it easier to undo a tight nut?

• A. It is made of a stronger metal
• B. It reduces the mass of the nut
• C. It removes friction
• D. The longer handle increases the moment

Question 6

A force of 40 N is applied 0.5 m from a pivot, at right angles. What is the moment, in N m?

Answer Nm

Question 7

On a seesaw, a child weighing 600 N sits 1 m from the pivot. How heavy must a second child sitting 1.5 m on the other side be to balance it, in N?

Answer N

Question 8

Why is it easier to open a door by pushing far from the hinges?

• A. A bigger distance from the pivot gives a bigger moment for the same force
• B. There is less friction there
• C. The door is lighter there
• D. Hinges push back

Question 9

A force of 50 N is applied 1.5 m from a pivot, at right angles. What is the moment, in N m?

Answer Nm

Question 10

On a seesaw, a child weighing 500 N sits 1.5 m from the pivot. How heavy must a second child sitting 1 m on the other side be to balance it, in N?

Answer N

Question 11

Why does a long spanner (wrench) make it easier to undo a tight nut?

• A. The longer handle increases the moment
• B. It reduces the mass of the nut
• C. It removes friction
• D. It is made of a stronger metal

Question 12

A force of 5 N is applied 0.5 m from a pivot, at right angles. What is the moment, in N m?

Answer Nm

Question 13

On a seesaw, a child weighing 400 N sits 2 m from the pivot. How heavy must a second child sitting 3 m on the other side be to balance it, in N?

Answer N

Question 14

Two children balance on a seesaw. The heavier child must sit…

• A. on the same side as the lighter child
• B. further from the pivot
• C. closer to the pivot
• D. exactly at the end

Question 15

A force of 50 N is applied 2 m from a pivot, at right angles. What is the moment, in N m?

Answer Nm

Question 16

On a seesaw, a child weighing 300 N sits 1 m from the pivot. How heavy must a second child sitting 2 m on the other side be to balance it, in N?

Answer N