Moments of Force Quiz: Product of Force and Distance

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Questions and Answers

What is the conventional sign convention for a clockwise moment of force?

Indeterminate

Positive

Zero

Negative (correct)

In the context of force moments, what is the direction of the line of action for an anticlockwise moment?

Towards the observer (correct)

Parallel to the observer

Away from the observer

Perpendicular to the observer

What does a positive moment of force signify in terms of rotation?

Stable position

No rotation

Clockwise rotation

Anticlockwise rotation (correct)

Why is torque considered a vector quantity while work or energy is considered scalar?

Because torque has both magnitude and direction Signup and view all the answers

What is the formula for moment of force?

Force x Perpendicular distance Signup and view all the answers

Why is the unit for moment of force (torque) not written as joule (J)?

Because torque has direction associated with it Signup and view all the answers

What are the units of moment of force?

Newton x Metre Signup and view all the answers

If the perpendicular distance from the point of rotation is zero, what happens to the moment of force?

It becomes zero Signup and view all the answers

In order to produce maximum turning effect on a body, where should the force be applied?

At a point with maximum perpendicular distance from the axis of rotation Signup and view all the answers

How does a force applied horizontally at a pivot point affect the body?

Rotates the body about an axis passing through the pivot point Signup and view all the answers

If a force applied on a body is not perpendicular to its axis of rotation, what effect does it have?

Induces rotational movement around the axis of rotation Signup and view all the answers

What two factors does the moment of force depend on?

Magnitude of the force and distance from the axis of rotation Signup and view all the answers

Which term is used to describe the product of the magnitude of a force and its perpendicular distance from the axis of rotation?

Torque Signup and view all the answers

In which system is the unit of moment of force gf x cm?

C.G.S. system Signup and view all the answers

How are Nm and dyne cm related?

$1 Nm = 10^5 dyne \times 10^2 cm$ Signup and view all the answers

What does a clockwise moment indicate?

Rotation in the negative direction Signup and view all the answers

In SI units, what is the unit for moment of force when force is measured in kgf?

$kgf \times m$ Signup and view all the answers

Study Notes

Moment of Force (Torque)

The turning effect of a force on a body depends on two factors: the magnitude of the force applied and the perpendicular distance of the line of action of the force from the axis of rotation (or pivoted point).
The product of these two factors is called the moment of force (or torque).
The moment of force is a vector quantity.

Units of Moment of Force

The S.I. unit of moment of force is newton x metre (Nm).
The C.G.S. unit of moment of force is gf x cm.
The unit of moment of force can also be kgf x m when force is measured in gravitational units.

Clockwise and Anticlockwise Moments

A clockwise moment is taken as negative, while an anticlockwise moment is taken as positive.
The direction of an anticlockwise moment is along the axis of rotation outwards (towards the observer), while the direction of a clockwise moment is along the axis of rotation inwards (away from the observer).

Application of Moment of Force

To produce the maximum turning effect on a body, a force should be applied at a point where the perpendicular distance from the axis of rotation is maximum.
This results in the maximum torque to turn the body.

Important Notes

The unit Nm of moment of force (or torque) is not the same as the unit joule (J) for work or energy, as torque is a vector quantity while work or energy is a scalar quantity.
A force can produce a turning effect on a body, causing it to rotate about an axis passing through the pivoted point.

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Description

Learn about moments of force in physics, including the conventions for positive and negative moments when a body is turned clockwise or anticlockwise. Explore how moments of force are vector quantities and the directions of clockwise and anticlockwise moments.

Understanding Moments of Force in Physics