# Mechanics - January 2006, Stage 4&5

## Problems

### Inside Outside

##### Stage: 4 Challenge Level:

Balance the bar with the three weight on the inside.

##### Stage: 4 Challenge Level:

If you were to set the X weight to 2 what do you think the angle might be?

### Balance Point

##### Stage: 4 Challenge Level:

Attach weights of 1, 2, 4, and 8 units to the four attachment points on the bar. Move the bar from side to side until you find a balance point. Is it possible to predict that position?

### Whoosh

##### Stage: 5 Challenge Level:

A ball whooshes down a slide and hits another ball which flies off the slide horizontally as a projectile. How far does it go?

### Whirlyball

##### Stage: 5 Challenge Level:

Whirl a conker around in a horizontal circle on a piece of string. What is the smallest angular speed with which it can whirl?

### Wobbler

##### Stage: 5 Challenge Level:

A cone is glued to a hemisphere. When you place it on a table in what position does it come to rest?