Turning on a pivot

The terms below have similar meaning about the turning object caused by force, except ...

• Moment

• Turning effect

• Fulcrum

• Torque

The unit of turning effect of force is ...

• N/m

• N.m

• N/m²

• N.m²

Factors cause the change in moment, except ...

• Perpendicular distance

• Mass

• Force

• Density

Look at the figure.

What is the moment of force ?

• 30 N.m

• 75 N.m

• 150 N.m

• 300 N.m

Why is it easier to open the bottle cap with spoon than coin ?

• Spoon has larger distance from pivot

• Coin has larger distance from pivot

• Spoon produces large force

• Coin produces large force

Look at the figure.

What is the condition of system ?

• System is balanced

• System turns in clockwise

• System turns in anti-clockwise

• System turns in clockwise then anti-clockwise

Look at the figure.

What is the distance x ?

• 10 cm

• 20 cm

• 30 cm

• 40 cm

Look at the figure.

What is the mass M ?

• 6 kg

• 10 kg

• 12 kg

• 18 kg

Levers is one example of moment.

Which one is class two levers ?

• Scissors

• Crowbar

• Fishing rod

• Wheel barrow

Look at the figure.

Which point is a pivot ?

• A

• B

• C

• D