1) Which of the following equations is correct? a) pressure = area x force b) pressure = force / area c) pressure = area / force d) force = area / pressure e) area = pressure x force 2) What is the SI unit of weight? a) stone b) kg (kilograms) c) N (Newtons) d) " (inches) 3) What is the SI unit of pressure? a) N/cm2 b) N (Newtons) c) kg/cm2 d) Pa (Pascals) 4) One pascal is equal to one... a) kg/cm2 b) kg/m2 c) N/m2 d) kg/cm2 5) What causes the feeling of pressure? a) the density of the substance around you b) the speed of the particles around you c) the force from the particles pushing on you 6) Why is there more pressure in a balloon if it is squashed? a) because the particles move faster b) because there are more particles colliding with the insides of the balloon c) because the particles have more energy d) because the particles can escape 7) A hydraulic system has one piston with an area of 2cm2 and another piston with an area of 15cm2. A 5N force is applied to the small piston. What is the pressure? a) 2.5 N/cm2 b) 2 N/cm2 c) 2.5 Pa d) 2 Pa 8) Rearrange the equation: pressure = force / area to find force. a) force = pressure x area b) force = pressure / area c) force = area / pressure 9) A hydraulic system has one piston with an area of 2cm2 and another piston with an area of 15cm2. A 5N force is applied to the small piston. What is the FORCE at the large piston? Clues: pressure in (2.5cm2) = pressure out. force = pressure x area a) 15 N b) 30 N c) 37.5 N d) 75 N 10) Why do you NOT want air in your car's brake fluid? a) gas cannot be compressed b) gas can be compressed due to spaces between the particles, so the brakes will not work c) gas can be compressed to help the brakes work 11) What is a moment? a) chocolate b) force x distance c) force / distance d) velocity x mass 12) What is the rule governing whether things balance or not? a) The clockwise moment = the anticlockwise moment b) The clockwise force = the anticlockwise force c) The clockwise distance = the anticlockwise distance 13) Rearrange the equations: f1 d1 = f2 d2 to find d2: a) d2 = (f1 d1)/f2 b) d2 = (f2 d1)/f1 c) d2 = (f1 f2)/d1 d) d2 = f1 d1 f2

Quiz - pressure

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