Y8 Moment

The beam is balanced. Which one is heavier?

• W

• Baby and basket

• same

What is the unit of force?

• Meter

• Centimeter

• Newton

Moment is a quantity that tells turning effect of a force about turning point. 

• TRUE
• FALSE

What is the unit of moment f force?

• N

• m

• Nm

• N/m

A wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the torque applied to the wrench?

• 7.5 Nm
• 1.5 Nm
• 750 Nm
• 150 Nm

Which one will loosened a nut more easily?

• a short spanner because a larger turning effect can be produced.

• a long spanner because a larger turning effect can be produced.

• a long spanner because a larger force can be produced.

• a short spanner because a larger force can be produced.

If these teams are pulling with the same amount of force what will happen?

• The boy in blue will win.
• They will not move at all.
• The boy in red will win.
• Both will fall down.

A force of 15N is applied to a lever arm to produce a turning moment of 45Nm. What is the distance from the pivot?

• 3m

• 15m

• 45m

• 0.33m

A force of 40N produces a turning moment of 120Nm. What is the distance from the pivot?

• 3m

• 480m

• 40m

• 0.33m

Seesaw Balance: A 40kg child sits 2 meters from the pivot point of a seesaw. How far from the pivot must a 30kg child sit to balance the seesaw?

Answer explanation

1. Seesaw Balance:

• - Let x be the distance the 30 kg child sits from the pivot.

• - 40 kg 2 m = 30 kg x

• - x = (40 * 2) / 30 = 8/3 meters ≈ 2.67 meters