A toy boat floats in a tank of very hot water. The boat is then transferred to a tank of very cold water. In the sketches below, which is the hot water – A or B? Explain your answer.
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Question No. 2
What is an ‘equilibrant force’? Draw a sketch to illustrate your answer.
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Question No. 3
Here is a sketch of two people in a swimming pool. One of them is fat; the other is thin but muscular. Which is which? Explain your answer.
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Question No. 4
A toy boat floats in a small tank of water. Now this system is transferred to the moon (in a suitable container, to prevent the water immediately boiling away). Will the toy boat? Explain your answer carefully.
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Question No. 5
Will lead float in mercury?
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Question No. 6
Would it be helpful to throw water on a petrol fire?
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Question No. 7
State the two conditions of equilibrium.
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Question No. 8
Your sister weighs exactly half of what you weigh. Explain where the two of you would sit on a see-saw to be balanced. Illustrate your answer.
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Question No. 9
An ocean liner steams from port A to port B, 500 km away. The water is the same temperature in both ports, and no passengers or cargo leave the ship, but at port B the ship is floating slightly higher in the water. Suggest a probable reason for this.
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Question No. 10
A seesaw is balanced when a mass of 10 kg is placed 1.2 m from the fulcrum, and a joint of meat is placed 65 cm from the fulcrum on the opposite side. What is the mass of the joint of meat? Show your working clearly.
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Question No. 11
A toy boat floats in a small tank of water. Now this system is transferred to the moon (in a suitable container, to prevent the water immediately boiling away). Will the toy boat
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