Add impurities

Raise temperature

Break surface tension

Metal is a better conductor of heat than wood.

The metal handle conducts heat away from the body faster than a wooden handle.

The thick walled glass is more likely to crack.

Glass is a poor conductor of heat. On the thick-walled glass, the inner wall expands more than the outer wall while the thin –walled glass expands uniformly.

Less friction in B

Second pulley in A reduces efficiency

The centrea of gravity is lowered /falls /w.t.e

Rise in temperature increases kinetic energy of gas molecules/particles increasing collision of the particles with walls of the container.

Speed is reducted.

Mass is increased and momentum is conserved.

The oil patch formed is one molecule thick/a monolayer.

(c).Advantages

-Makes walking easier

-Friction between matchstick head and rough surface develops heat igniting the stick head

-Friction between brake drum and brake lining halts the vehicle

Disadvantages

-Causes wear, tear and noise between moving parts of a system

-Causes energy loss since work has to be done against it

(a). At high pressure is low so boiling point is low pressure cooker increases pressure inside