- a) Write in one sentence what the teacher in the video is trying to explain:
- b) What are the simplest of all machines based on?
- c)What type of work is put in a machine?
- d) Archimedes said: “Give me a …fulcrum… and I will …move…the …earth…”
- e) Which force is bigger in a lever?
1.- Name three machines with one or few parts, and three machines with many parts:
A pen, glasses, a watch. A computer, a mobile phone and a fan
2.- What machines do you see in the situation of a hospital:
A stratcher, a hammer, a scalpel and a syringe
3.- Name three objects that contain simple machines and three with compoud machines:
A wheelbarrow, a seesaw and well. A car, an airplane and a truck
4.- Find out how many simple machines are combined in a wheelbarrow:
A lever, some screws, wheels and axles
5. Complete the sentences:
- a) Machines are objects that help save time and energy
- b) Planes and cars are compound machines
- c) All machines need energy in order to function.
6. Complete a sentences of these objtects where you describe the energy that they use for.
- a) vacuum:
- b) helicopter: they use combustible fuels to work
- c) stapler: they use people force to work
7. You should always take care when using machines. Think of these machines that you can use and write how the canbe dangerous and give a safety rule.
- a) Knives: We can cut ourself. We shouln´t play with them.
- b) plug: we can suffer an electrical shock
- c) jigsaw: you can cut yourself
- d) pistol glue: you can burn yourself
- e) drill: you can cut yourself
8. What sort of SIMPLE MACHINES are these objects?:
- a baseball bat : a lever
- the front of a ship : an wedge
- the fan blades : a lever
- a toilet paper dispenser : a wheel
- a door knob : a lever
- a broom : a lever
9. Find out the MACHINES that these objects got:
- Stapler: a) wedge b) lever c) wheel
- Wheel barrow: a) axle b) wheel c) lever
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