Consider the situation drawn below where a paddle is placed in a bucket of water. The paddle has wound onto it two strings, each of which has a 500g mass hanging off it. The strings are wound so that the paddle will turn in the water when the masses are allowed to fall.

1. What will happen as the masses drop ? Please explain your answer.

2. What happens to the temperature of the water? Please explain why you have made this prediction.

3. The temperature of the water increases. Explain the mechanism responsible for the temperature to increase. (similar to the temperature in the syringe increasing when the plunger is moved in)

4. How could you predict the change in temperature of the water? Explain.