Question

Write true (T) or false (F) against the following statements.
1. Larger the magnitude of force applied, more will be the turning
effect on the body.
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Answer 1

Answer:

its true(T)

Explanation:

If a force acts on the object, the object turns around the pivot.

The turning force is called a torque and the effect it produces is called a moment.

The bigger the force, the greater the moment. The moment also increases if the force acts at a greater distance from the pivot .so.

the two factors which affects. the turning effect of the force.

• the first is the magnitude of the force applied on the body
• the second is the perpendicular distance from the line of action of force and the axis of rotation of the body

Answer 2

Answer:

True.

Explanation:

We utilise the turning effect of forces (moments) on a daily basis, for example when we use devices such as levers. However, in some circumstances we need to prevent the turning effect of forces by balancing them with an opposing moment. Understanding the principles involved allows us to both utilise and prevent the turning effect of forces.

Moments

A moment is the turning effect of a force around a fixed point called a pivot. For example, this could be a door opening around a fixed hinge or a spanner turning around a fixed nut.

The size of a moment depends on two factors:

the size of the force applied

the distance from the pivot to the line of action of the force

This explains why less force is needed to open a door by pushing at the side furthest from the hinge than at the side closest to the hinge. To push at the hinge side of the door requires more force to be exerted because the distance is smaller.

A moment can be calculated using this equation:

M = F × d

where:

M = the moment of the force in newton-metres, Nm

F = the force in newtons, N

d = the perpendicular distance from the line of action of the force to the pivot in metres, m

Worked example

A spanner is used to undo a nut. A force of 25 N is applied to the end of the spanner, which is 10 cm away from the centre of the nut. Calculate the moment when the spanner is horizontal.