(a)[3]
Some vehicles are fitted with broad tyres so that they can move across soft mud. Explain why the broad tyres allow these vehicles to travel over soft mud.
(b(i))[1]
State what occupies the space at Y above the mercury.
(b(ii))[2]
Complete the statement below to describe the use of a mercury barometer. A mercury barometer measures ..........
(c(i))[1]
State how the water pressure at hole 2 compares with the water pressure at hole 3.
(c(ii))[1]
On Fig. 4.2, draw the water stream emerging from hole 1.