Question

3. Which of these would not occur in a world
without friction?
a) You would not be able to walk
b) Automobiles would not be able to run on
the roads.
c) You would not be able to warm your
hands by rubbing them together
d) Automobile brakes would work very well.
Which of the following is not a disadvantage
of friction?
a) Friction causes wear and tear of machine
parts
b) Friction causes forest fires.
c) Friction produces heat energy
d) Friction makes nails and screws hold on
to walls.
5. In which of these cases is friction a
disadvantage?
a) the running of a machine
b) walking
c) applying brakes
d) writing
6. Friction can be increased by
a) making the surfaces rough
b) lubricating the surfaces
c) using ball bearings
d) using streamlined shapes
7. Friction can be reduced by
a) using streamlined shapes
b) making the surfaces rough
c) using sand and gravel
d) using spikes
8. Which of these items lower friction?
a) wheels
c) spikes
b) grooves
d) gravel and sand

please solved it and I follow you and I follow you​

Answer 1

3. Answer

d) Automobile brakes would work very well.

4. Answer

d) Friction makes nails and screws hold onto walls.

5.Answer

a) the running of a machine

6.Answer

a) making the surfaces rough

7.Answer

a) using streamlined shapes

8.Answer

a) wheels