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Give two reasons why the efficiency of a...

Give two reasons why the efficiency of a single movable pulley is not 100%.

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To explain why the efficiency of a single movable pulley is not 100%, we can break it down into two main reasons: ### Step-by-Step Solution: 1. **Friction Between the Pulley and the String**: - In a movable pulley system, there is friction between the pulley and the string. This friction occurs because the string rubs against the surface of the pulley as it moves. - When friction is present, some of the input energy is converted into heat energy instead of being used to lift the load. This energy loss due to friction reduces the overall efficiency of the pulley system. ...
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