8.' Friction is our friend as well as foe'. Give two examples each to support
this statement.
(2)
9. a)Name the device shown in the given diagram and state its use. Label the
parts named A, B and C.
b) What happens when a glass rod rubbed with silk is brought in contact
with the tip of the metal rod? Why?
c) What happens if you touch the tip of the metal rod immediately? (5)
- А
- B
C
Answers
Answer:
8. Examples to show that friction is a friend and a foe: Friction is a friend: (i) Friction allows us to grip and catch different objects. (ii) It helps us to walk comfortably on the surface. (iii) It helps to minimize the speed or to stop the moving objects. ... Friction is foe: (i) Friction causes wear and tear in objects
9) a) i)metal rod
ii) leave of aluminum foil
iii) metal disc
b) When the glass rod is rubbed with silk, the silk strips electrons from the rod, leaving it a positive charge. When the hard rubber rod is rubbed with wool, it gains electrons from the wool, gaining a negative charge
c) The leaves of an electroscope collapse as soon as we touch the metal cap with hand because the leaves of the charged electroscope lose charge to the earth through our body. This process is known as EARTHING
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