5.4 - moments levers and gears

Question 1

what is a moment

Answer 1

turning effect of a force

Question 2

What distance measurement is used when
calculating a moment?

Answer 2

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

Question 3

If an object is in equilibrium, what can be
said about the moments acting on the object?

Answer 3

The clockwise moments are equal to the
anticlockwise moments.

Question 4

What three parts make up a lever system?

Answer 4

1. Load
2. Effort
3. Pivot

Question 5

How can a lever be used as a force
multiplier?

Answer 5

distance between the effort and pivot is
greater than the distance between the pivot and the load
the force applied is bigger than the effort force

Question 6

Give an example of when a lever may be used to
multiply a force.

Answer 6

A wrench,

Question 7

What determines the moment of a gear
wheel?

Answer 7

radius of gear

Question 8

a big wheel of 24 teeth compared to a smaller one of 12

Answer 8

turns at half the speed
but the moment will be twice as big

Question 9

ratio of moments

Answer 9

= ratio of radii