Energy QA

Use these questions to help you revise. Move the mouse over the hidden text in the answer box to see the example answers

	*QUESTIONS*	ANSWER BOX
1.	Think of two ways to give energy to a doll that walks.	1) Clockwork
		*2) Electric or battery.*
2.	Where would the dolls above get the energy needed to move?	1) From energy stored in your body
		*2) From energy stored in the battery.*
3.	Name three examples of stored (potential) energy.	*Chemical energy, gravitational energy* *elastic potential (distortion) energy.*
4.	Give another name for movement energy,	*Kinetic energy.*
5.	The battery in a torch stores 100 joules of energy, and 30 joules are given out as energy lighting up the room. How much energy is wasted heating up the room?	*100 - 30 = 70joules.*
6.	What are the energy transfers when a stone is fired from a catapult?	*Energy stored in your body is transferred* to - energy stored in the stretched elastic; - movement energy of the stone.
7.	a) What does kJ stand for?	*a) Kilojoule.*
	b) How many joules are there in 1 kJ?	*b) 1000joules.*
8.	What is the 'fuel' our bodies run on?	*The food we eat.*
9.	Which of these foods has the most energy in an average portion? carrots, sausage, bananas, eggs.	*Sausages.*
10.	What things affect the amount of energy a person needs?	A person's size, how active they are and *how fast they are growing*
11.	What happens if you take in more energy than you	*The energy is stored as far*
	use up?	*(chemical energy).*
12.	Name three fuels that can be used to heat homes.	*Coal, oil, gas, paraffin wood.*
13.	What is the difference between a renewable and a non-renewable source of energy?	*Once we have used up the non-renewable sources they can't be replaced*
14.	Explain why fossil fuels are non-renewable.	*Because they took millions of years to form,* *so once they are used up they are gone for ever.*
15.	Name three renewable energy sources.	*Wind, waves, tidal, geothermal, biomass,* *sun (solar) and hydroelectric* *(gravitational)*

ENERGY