Sound
Renewable and non Renewable energy
Simple Machines
Light
Complex Machines
100
How is sound produced?
Sound is produced when objects vibrate.
100
What are three types of renewable energy?
Sun, wind, and water.
100
What is the definition of a machine?
A machine is something we use to make work easier.
100
What is the definition of a light source?
Light sources are things that produce light.
100
Name one form of transport that is a complex machine and tell us how they get their energy.
Cars, buses, and lorries use fuels like petrol and diesel to work. Bicycles use energy from people.
200
Compare and describe how loud sounds and quiet sounds travel.
Loud sounds travel further than quiet sounds, and a sound is always louder nearer its source.
200
Which types of energy sources cause more pollution?
Non-renewable energy sources like fossil fuels. They cause pollution and can harm the environment.
200
Which two simple machines are used to make a pencil sharpener?
The simplest machine in a hand-held pencil sharpener is the razor, which acts as a wedge because of its angle, and the screw that keeps the razor attached to the outer plastic covering.
200
The light from the Sun looks white, but it´s made up of seven different colors. We can see these seven colors in a rainbow in the sky. Name those colors.
Red, Orange, Yellow, Green, Blue, Indigo, and Violet.
200
Machines are improving all the time. They´re getting quicker, more efficient and safer to use. What is the definition of efficient?
Something that works very well and doesn´t waste energy.
300
What happens to sound in space? Why?
Sound can´t travel when there´s no air. This means there´s no sound in space or on the moon.
300
Where does most of our electricity come from?
Power stations that use energy sources like coal, oil, and gas to make electricity.
300
A lever is a rigid bar with a support. We use it to lift or move objects. What is the support called?
A fulcrum.
300
What happens when light hits an opaque object?
A shadow forms on the opposite side of the object.
300
A robot is a machine that can do work automatically. What does this mean?
This means that a robot can do things on its own without thinking. Robots use electricity and can be controlled by people using computers.
400
What are two things that happen when sound travels in a place like a cave?
Sound can reflect off the walls of a cave. When this happens, we can hear an echo.
400
What are three types of fossil fuels, why do we call them fossil fuels?
Coal, oil, and gas are called fossil fuels. This is because they take millions of years to form.
400
What is the definition of both a simple machine and complex machine?
Simple machines have few or no moving parts. When we put simple machines together we get a complex machine. Complex machines need energy to work.
400
Name an insect or deep sea fish that produces its own light.
Firefly or the lantern fish.
500
What are three things sound often travels through?
Air, water, and also through solid, opaque objects.
500
What is the definition of Renewable Energy?
Renewable energy is energy that can we obtain from renewable energy sources, this means that we can use them again and again and they´ll never run out. run out - to use all of something and have nothing left
500
Explain how two types of simple machines work. Choices - Pulley, screw, wedge, or inclined plane.
A pulley uses a wheel and a rope to lift or lower and object. A screw is a type of inclined plane. We use it to hold things together or lift objects. A wedge is an object with at least one slanting edge. We use it to cut objects. An inclined plane is a slanting surface that connects a low level with a high level. We use it to move objects up or down.
500
How fast does light move?
Light travels at about 300,000 km per second.
500
Name two simple machines on a bicycle and explain how we use them when riding a bicycle.
We hold the handlebars and use these to change directions. The handlebars are levers. The pedals are levers, too. We push the pedals with our feet, and when the pedals turn around, the wheels of the bicycle turn around, too. When we want to go up or down a hill, we use our hands to change the gear controls. The gears are pulleys and the force travels along the chain to the back wheel. When we want to stop the bicycle, we use our hands to push and pull the brake levers. This force travels along cables to the brakes. The brakes press against the wheels and this force slows the speed of the bicycle.
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