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#### Resources tagged with Relative velocity similar to Which Twin Is Older?:

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##### Other tags that relate to Which Twin Is Older?
biology. chemistry. engineering. Energy. Investigations. physics. Relative velocity. Time. Mathematical modelling. Vectors.

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Broad Topics > Mechanics > Relative velocity

### Which Twin Is Older?

##### Stage: 5

A simplified account of special relativity and the twins paradox.

### In Constantly Passing

##### Stage: 4 Challenge Level:

A car is travelling along a dual carriageway at constant speed. Every 3 minutes a bus passes going in the opposite direction, while every 6 minutes a bus passes the car travelling in the same. . . .

### Stonehenge

##### Stage: 5 Challenge Level:

Explain why, when moving heavy objects on rollers, the object moves twice as fast as the rollers. Try a similar experiment yourself.

### Escalator

##### Stage: 4 Challenge Level:

At Holborn underground station there is a very long escalator. Two people are in a hurry and so climb the escalator as it is moving upwards, thus adding their speed to that of the moving steps. . . .

### Take a Message Soldier

##### Stage: 4 and 5 Challenge Level:

A messenger runs from the rear to the head of a marching column and back. When he gets back, the rear is where the head was when he set off. What is the ratio of his speed to that of the column?