Grades 6, 7 and 8 | Science | Middle School

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Science: Middle School: Grades 6, 7 and 8 Quiz - Moments (Questions)

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Pushing or pulling the handle of a wrench connected to a nut or bolt produces a moment (turning force) that loosens or tightens the nut or bolt. In the field of Science, forces can be used to turn objects about a pivot (fixed point).

Take a moment or two to have a go at our quiz about moments!

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

[ ]	force and distance from the pivot
[ ]	force and mass
[ ]	force and weight
[ ]	mass and distance from the pivot

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

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

[ ]	200Nm
[ ]	400Nm
[ ]	600Nm
[ ]	800Nm

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

[ ]	200Nm
[ ]	700Nm
[ ]	1,000Nm
[ ]	10,000Nm

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

[ ]	1,700Nm
[ ]	1,800Nm
[ ]	2,200Nm
[ ]	3,500Nm

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

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

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

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

Science: Middle School: Grades 6, 7 and 8 Quiz - Moments (Answers)

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

[x]	force and distance from the pivot
[ ]	force and mass
[ ]	force and weight
[ ]	mass and distance from the pivot

The unit for a moment is Nm - newtonmetre

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

[ ]	if the force and distance from the pivot are decreased
[x]	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

Moment = force x distance

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

[ ]	200Nm
[ ]	400Nm
[x]	600Nm
[ ]	800Nm

Moment = force x distance = 400 x 1.5 = 600Nm

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

[ ]	200Nm
[ ]	700Nm
[x]	1,000Nm
[ ]	10,000Nm

Distance = 200cm = 2m moment = 500 x 2 = 1,000Nm

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

[ ]	1,700Nm
[x]	1,800Nm
[ ]	2,200Nm
[ ]	3,500Nm

Moment = (300 x 2) + (400 x 3) = 1,800Nm

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
[x]	3m
[ ]	5m

Moment = force x distance, 1,800Nm = 600 x ? = 3m

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

[x]	2Nm
[ ]	20Nm
[ ]	200Nm
[ ]	2,000Nm

Distance = 20cm = 0. 2m moment = 10 x 0. 2 = 2Nm

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
[x]	Half the force
[ ]	The same force

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

[ ]	5N
[ ]	50N
[ ]	100N
[x]	500N

10cm = 0.1m, 50 = force x 0.1, force = 50/0.1 = 500N

10.

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

[ ]	4N
[ ]	80N
[x]	400N
[ ]	800N

20cm = 0.2m, 80 = force x 0.2, force = 80/0.2 = 400N