Moments

Question 1

What is an alternative name for the turning effect of a force?

Answer 1

A moment

Question 2

State the equation used to calculate the moment of a

force. Give appropriate units

Answer 2

Moment of force = Force x Distance

Moment (Nm), Force (N), Distance (m)

Question 3

What distance measurement is used when

calculating a moment?

Answer 3

The perpendicular distance from the

pivot to the line of action of the force

Question 4

If an object is in equilibrium, what can be said about

the moments acting on the object?

Answer 4

The clockwise moments are equal to the

anticlockwise moments.

Question 5

How do levers make use of moments?

Answer 5

They increase the perpendicular
distance of the force from the pivot, so
decrease the force needed to produce
the same moment

Question 6

Will this object rotate? If so in which direction?

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page 12

Answer 6

No. The clockwise and anticlockwise moments
are equal, therefore the object remains in
equilibrium.

Question 7

How are levers used to decrease the force

required to lift something?

Answer 7

Levers use a pivot point and
the concept of moments to
reduce the force. The further
you are away from the pivot
point, the less force you
need to lift the object up.

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Question 8

How does lubricating levers/gears improve

efficiency?

Answer 8

There is less resistance; less energy is
wasted/dissipated (as heat) overcoming
frictional forces.