4 Write sentences about these machines and energy.
(a)
a
b
c
d
This machine needs energy from the wind to work.
(b) (c) (d)
3
5 Complet Complete e the table about machines and their functions. Function (a)
mechanical
Example (b)
(c)
(d)
(e)
(f)
heater 4
6 Complet Complete e the definitions. (a) The
casing is the outer part of the machine.
(b) The the machine.
are the individual components of
(c) A is a group of components which work together to perform a specific function. (d) An or a motor is the part of the machine which produces movement.