They are made up of a number of simple machines working together.
100
What kind of energy does a bicycle need?
Kinetic energy
100
What is a machine? How are they classified?
Its something we use to make work easier. They are classified as simple machines or complex machines.
200
What is a simple machine that uses a wheel and a rope to lift or lower an object?
A pulley
200
What do complex machines need to work? Where does it come from?
They need energy to work. This energy can come from people, electricity, or fuel.
200
What type of simple machine are handlebars?
They are levers
200
What is a robot?
a machine that can do work automatically
300
What is a slanting surface that connects a low level with a high level?
An inclined plane
300
Give two examples of complex machines in your home. Where does the energy come from?
Washing machines and cookers. Electricity
300
What are pedals? What type of simple machine are they?
We push the pedals with our feet, and when the pedals turn around, the wheels of the bicycle turn around too.
They are levers
300
Does a pulley make an object feel lighter or heavier?
Lighter
400
What is a rigid bar with a support called a fulcrum? Give an example.
A lever
400
Give me a form of transport that uses fuel and a form that uses energy from people.
Car or bus
Bicycles
400
What are gears? What type of simple machine are they? Where are they found?
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.
400
What is a wheel? Give an example.
Its a circular object that turns around an axle. We use it to lift or move objects.
Car wheel
500
What is a type of inclined plane one uses to hold things together or lift objects? Give an example.
A screw.
A Jar.
500
What is something that works very well and doesn´t waste energy?
Efficient
500
What are brakes? How do they work? What type of simple machine are they?
When we want to stop the bicycle, we use our hands to push and pull the brake levers. The brakes press against the wheels and this force slows the speed of the bicycle.
500
What kind of energy do robots need? Why do we need them?
electricity
To do dangerous jobs. We send robots to other planets to investigate soil, rocks, and the atmosphere and the robots send information back to Earth.