# Frequent question: How do old clocks work without batteries?

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## Did they have clocks before electricity?

Sundials and water clocks originated from ancient Egypt, and were later used by the Babylonians, the Greeks and the Chinese; medieval Islamic water clocks were unrivalled in their sophistication until the mid-14th century.

## How do grandfather clocks work without electricity?

They do stop without intervention. Grandfather clocks have to be reset. They are designed so that you can wind them back up. … Eight-day clocks are often driven by two weights – one driving the pendulum and the other the striking mechanism, which usually consisted of a bell or chimes.

## How does a simple clock work?

The energy is usually stored in a weight or spring. When it is wound, energy is transferred from our muscles and into the driving weight (as it moves up against the force of gravity) or the mainspring (as it tightens up). This energy is released into the timekeeper as the weight drops or the mainspring unwinds.

## Can clocks work without electricity?

Unlike their digital and quartz counterparts, mechanical clocks don’t depend on a battery to keep time. Instead, they harness the energy stored in a wound spring. This is why all mechanical clocks must be wound to continuously keep accurate time. Every mechanical clock needs energy to run.

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## What causes a pendulum to slow down and stop swinging?

When the swing is raised and released, it will move freely back and forth due to the force of gravity on it. The swing continues moving back and forth without any extra outside help until friction (between the air and the swing and between the chains and the attachment points) slows it down and eventually stops it.

## What force makes a pendulum stop swinging?

A pendulum stops oscillating because it loses energy when it is converted into heat. Even without air friction, the friction which exists with the point around which the pendulum rotates causes the system to lose kinetic energy and eventually stop.

## What kind of motion is executed by a pendulum of a wall clock class 6?

(D) Oscillatory motion. A pendulum of a wall clock is suspended from a fixed point. It travels sideways from its equilibrium position as the second progress. Motion is defined as the change in an object’s position with time.

## Why does the weight of a pendulum not affect the swing?

The mass of the bob does not affect the period of a pendulum because (as Galileo discovered and Newton explained), the mass of the bob is being accelerated toward the ground at a constant rate — the gravitational constant, g.