Forces 1 *

Question 1

What is a moment?

Answer 1

the turning effect of a force
act about a point in a clockwise or anti-clockwise direction

Question 2

What is a pivot?

Answer 2

also known as a fulcrum
a point around which something can rotate or turn

Question 3

How do you calculate the moment of a force?

Answer 3

moment = force x distance
(Nm) (N) (m)

Question 4

What is distance in relation to a moment?

Answer 4

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

Question 5

WHat is the moment if an object is balanced?

Answer 5

the total clockwise moment about a pivot is equal to the total anticlockwise moment about that pivot

Question 6

What is a lever?

Answer 6

it consists of a pivot, an effort and a load

Question 7

Levers

Fill the gaps :

A simple lever could be a solid beam laid across a pivot. As _____ is applied to _____ one end about the pivot, the opposite end is also ______ about the pivot in the same ________. This has the effect of rotating or _______ the load.

Answer 7

A simple lever could be a solid beam laid across a pivot. As effort is applied to rotate one end about the pivot. The opposite end is also rotated about the pivot in the same direction. This has the effect of rotating or lifting the load.

Question 8

Levers

Fill the gaps :

The ______ the lever, and the _______ the ______ acts from the pivot, the _______ the force on the load will be

Answer 8

The longer the lever, and the further the effort acts from the pivot, the greater the force on the load will be

Question 9

What are gears?

Answer 9

wheels with toothed edges that rotate on an axle or shaft
connects with other gears to rotate them

Question 10

Gears

Fill the gaps :

The forces acting on the teeth are the ____ for both gears, but their moments are _________
If the driven gear is made larger is will rotate more _______ but with a ______ moment
If the driven gear is made smaller it will rotate more ______ but with a ______ moment

Answer 10

The forces acting on the teeth are identical for both gears, but their moments are different
If the driven gear is made larger is will rotate more slowly but with a greater moment
If the driven gear is made smaller it will rotate more quickly but with a smaller moment