Turning Effect of Force (Moments) 1

Define the moment of a force.

• The moment of a force is the product of the force and the distance from the pivot point to the line of action of the force.
• The moment of a force is the sum of all forces acting on a pivot point.
• The moment of a force is the angle at which the force is applied.
• The moment of a force is the total force acting on an object.

A turning object has a moment and there are two possible directions. Which are...

• clockwise and counterclockwise
• leftward and rightward
• upward and downward
• forward and backward

The unit for moment of a force is...

• Newton (N)

• Pascal (Pa)
• Newton-meter (N·m)
• Joule (J)

What is the effect of increasing the distance from the pivot point on the moment of a force?

• It increases the moment of the force.

• It decreases the moment of the force.

• It has no effect on the moment of the force.

• It reverses the direction of the moment.

Which of the following factors does NOT affect the moment of a force?

• The magnitude of the force

• The distance from the pivot point

• The direction of the force

• The luminosity of the object

For an object that is turning, what is the purpose of the pivot?

• The pivot is used to increase the speed of rotation.
• The purpose of the pivot is to provide a fixed centre point for rotation.

• The pivot allows the object to move freely in any direction.
• The pivot serves as a weight to stabilize the object.

Which of the following statements about the moment of a force is true?

• It is always a scalar quantity.

• It can be zero if the force is applied at the pivot.

• It is independent of the distance from the pivot.

• It is only relevant in rotational motion.

What is the moment acting on the left side of the pivot?

• 2 Nm

• 20 Nm

• 200 Nm

• 0.2 Nm

A force of 4 N acts on a lever 2 m from the pivot. What is the moment?

• 8 Nm

• 6 Nm

• 2 Nm

• 3 Nm

A force exerts a moment of 2 Nm. What is the distance of the force from the pivot?

• 2 m

• 4 m

• 1 m

• 0.5 m