Principle of Moments (H)

A moment is

• a significant time shared by people in love

• the turning effect of a force

• the rate of transfer of energy

What is the unit of a moment?

• N

• m

• Nm

• N/m

What is the size of the moment shown by the black arrow?

• 30 Nm

• 36 Nm

• 40 Nm

• 60 Nm

What is the anticlockwise moment acting on this crane?

• 80,000Nm
• 100,000Nm
• 120,000Nm
• 140,000Nm

Tags

NGSS.HS-PS2-1

What is the moment produced by the 15 N?

• 15 Nm (clockwise)
• 150 Nm (anti - clockwise)
• 1.5 Nm (anti - clockwise)
• 0.15 Nm (clockwise)

State the principle of moments.

• When a system is in equilibrium, the sum of the total clockwise moment is equal to the sum of the total anti-clockwise moment about the same pivot.

• When a system is in equilibrium, the sum of the total clockwise moment is greater the sum of the total anti-clockwise moment about the same pivot.

• When a system is in equilibrium, the sum of the total clockwise moment is less than the sum of the total anti-clockwise moment about the same pivot.

Assuming the system is in equilibrium, calculate the missing distance d

• 3.4 m

• 2.8 m

• 4.4 m

• 1.6 m

Tags

NGSS.HS-PS2-1

A boy of weight 600N sits on the see-saw as shown at a distance of 1.5m from the pivot. What is the force F required at the other end to balance the see-saw?

• 450 N

• 350 N

• 4.5 N

• 200 N

Calculate the unknown force X!

• 4.0 N

• 6.0 N

• 10 N

• 12 N

Tags

NGSS.HS-PS2-1

At what distance should a 2N load placed from the pivot so that the see saw won't move?

• 0.2m

• 0.5m

• 0.45m

• 0.42m

Tags

NGSS.MS-ETS1-1

NGSS.MS-ETS1-2