Physics
Friction :
- causes wear and tear
- produces heat
- stops a moving body
- has all the above disadvantages
Force
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Answer
has all the above disadvantages
Reason — Disadvantages of friction are :
- Friction opposes the motion of a body, so it decreases the efficiency (i.e., more force is needed to move a body).
- Friction causes wear and tear in the moving parts.
- Friction produces heat.
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Related Questions
Friction :
- promotes motion
- opposes motion
- acts in the direction of motion
- is always a nuisance.
Friction is reduced by :
- making the surfaces wet
- making the surfaces dry
- making the surfaces rough
- sprinkling sand on the surface.
Friction is increased if :
- an oil is sprayed
- the surfaces are made wet
- the surfaces are made dry
- the surfaces are polished
Fill in the blanks :
(a) Force is applied as …………… or …………… .
(b) On squeezing a gum tube, its …………… changes.
(c) On pulling a string, its …………… increases.
(d) A moving football when kicked, its …………… changes.
(e) On applying brakes on a moving car, its speed …………… .
(f) We use ball bearings to …………… the friction.
(g) Friction …………… motion.
(h) Lubricants are used to …………… friction.
(i) Friction causes …………… of moving parts of a machine.