P2 Levers and Moments

Question 1

Label the arrows to show which girl causes a clockwise turning force and which causes an anticlockwise turning force.

Answer 1

Question 2

What is the equation for calculating moments?

Answer 2

Moment (Nm) = Force (N) x Distance from Pivot (m)

Question 3

What is the law of moments?

Answer 3

That when the anticlockwise and clockwise moments are the same, the object is in equilibrium.

Question 4

What is the scientific name for a turning force?

Answer 4

A moment.

Question 5

Add the labels: pivot, distance and force (effort) to the correct spaces.

Answer 5

Question 6

A balanced see-saw is said to be in…

Answer 6

equilibrium

Question 7

What is the moment of the man on the right?

Answer 7

moment = force x distance from pivot

moment = 1000N x 0.5m

moment = 500 Nm

Question 8

What is the momemnt of the girl on the left?

Answer 8

moment = force x distance from pivot

moment = 500N x 1m

moment = 500 Nm

Question 9

What are the units of a moment (turning force)?

Answer 9

Newton metres (Nm)

or

Newton centimetres (Ncm)

Question 10

A force of 100N is applied to a see-saw, 0.5m from the pivot. At what distance from the pivot should a force of 25N be applied to balance the see-saw?

Answer 10

2m