Manual Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide (page 23 of 62) (English)

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Teacher’s Notes

If time allows you may wish to

demonstrate other examples of objects

that remain stationary and have clearly

identifiable and familiar forces acting on

them. For example, an object

suspended from a string, thread or

elastic band will remain in that position.

If, however, the weight of the object

is increased, a point will be reached

at which the string will break and the

object will fall. At the point at which

the string breaks, the forces acting on

it are unbalanced. In other words,

the weight of the object (load) is now

greater than the resistance (load

bearing capacity) of the string.

Talk about how mechanisms such

as levers (balances) and familiar

playground equipment or machines

also need to have forces applied to

them to make them move. All machines

need a force to be applied to them to

make them work.

 • Askthechildrentoidentifywhatotherforcesmayhave

acted on the balance to stop it moving.

* What force slows up the arms and eventually stops

them moving?

 * Frictioninthepivotjointand

air resistance.

Friction is the force that opposes

movement. In the pivot joint, friction

has the effect of slowing down the

movement. It acts just like a brake.

If both arms are of equal weight,

then the force due to gravity acting

on both sides will be equal and, in

theory, the arms will come to rest in

a horizontal position.

* Why do the arms eventually stop in a

horizontal position?

* Both arms are equal in weight

and so the forces acting on

each side are equal.

* What force is acting on each arm now?

* Gravity.

balance arm will move in the direction

of the larger force. This is a general law

of physics.

Lesson�3:�The�Balance

Education

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Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide Instructions - German - 62 pages

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Knex 78610 - Education Intro to Levers and Pulleys Teachers Guide Manual

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