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11. Simple mechanisms

Why do you think door handles are
always located at the opposite side of In Units 5, 9 and 10 you learnt:
the door to the hinges? ✔ when mechanical work is done Physics

textbooks nis edu kz
✔ that the action of force can lead to a
change of speed in the object/body or its
deformation
✔ an equation for calculating efficiency

In this unit you will learn:

✔ how to find the centre of gravity of plane
figures by experimenting

✔ what torque (turning force) is and its
application in daily life
✔ about types of simple machines and how to
calculate their efficiency

✔ how to calculate the efficiency of an inclined
plane by experimenting

Key phrases:

✔ Simple machines offer an advantage in …
but in …
✔ The efficiency of an inclined plane is defined as a
ratio of …

✔ A movable pulley provides a mechanical
advantage in … , while an immovable pulley
provides an advantage in …

✔ A lever is at equilibrium when …
✔ Turning force is calculated as the product …

CCL In Maths classes you learnt how to use the
direct and inverse proportional dependence
of functions. These skills will help you with
problem-solving in Physics.

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