FRICTION AND HEAT
From early times friction has been used to start
__________________.
Rubbing ________________________ together and
generating heat would cause __________ grass to smoulder
then ___________________ into flame.
Even today the heat produced by
________________________ is used to strike
_________________. Friction also produces the spark in
some gas _________________
Friction is also responsible for the heat resulting from the
__________________ of wood, _________________________
of metal or the cutting of metal with a __________________
With machine ____________________ like lathes used to
shape metals care must be taken to ____________________
heat caused by friction. Oil or _________________ is
sprayed on the metal to _____________________ it. Heat
resistant metals like _________________ do the cutting.
Q1. Place the following words into the above passage.
Tools filing burst dry remove
tungsten hacksaw sticks sawing
friction
fires
lighters
matches
cool
water
Q2. Which word in the passage means
a) To burn slowly with smoke
____________________
b) Created
____________________
c) A flash of light
____________________
d) Trustworthy
____________________
e) Give attention and thought
____________________
f)
____________________
Dispersed in very small droplets
g) Prevents penetration
____________________
Q3. From the information in the passage list two instances where friction is encouraged and two instances
where friction is reduced.
_____________________________________________________________________________________
___________________________________________________________________
Q4. Which paragraph describes –
a) Some modern application of friction
__________________________________________________________________
b) Reducing friction in machines
__________________________________________________________________
c) Ways that friction can be produced when working with timber and wood
__________________________________________________________________
d) Early applications of friction
__________________________________________________________________
Q5. What energy change occurs in all of the examples listed in the passage?
________________________________________________________________________
Q6. Think of two other everyday situations where friction produces heat.
_____________________________________________________________________________________
___________________________________________________________________