Forces in Water and Air, and Energy Resources
How things float, sink and fly, and where our energy comes from.
9 questions, free, marked as you go with a worked explanation on every one.
What this covers
- floating lift and energy
The questions
- Why does a large steel ship float when a small steel nail sinks?
- What is the upward force that water exerts on an object placed in it?
- Why do aeroplanes have wings with a curved upper surface?
- Which of these are renewable energy resources? Select all that apply.
- What is one advantage of wind power over burning coal?
- A submarine takes water into its tanks. What happens and why?
- A small wind turbine on a farm produces 3 kW of power while it is turning, and on a windy week it turns for 8 hours each day. How much energy does it produce over 5 such days, in kilowatt hours?
- Two blocks are exactly the same size. Block A has a mass of 40 g and Block B has a mass of 120 g. Placed in a tank of water, Block A floats and Block B sinks. What does this show?
- Use the table. Which energy source produces the most power, on average?