inside surface of the tyre, As the tyre heats up 75 Pa they impart a force and, during travel, the air (a) 8000 Pa therefore, a pressure is particles inside will collide 220 000 N created. with the inside surface of 720 N the tyre more often and 60 m2 -273 °C is the with more force. 3.5 m2 temperature at which If the pressure gets too particles stop vibrating and high, the tyre burst. 149 Pa so, as a result, it’s the coldest possible 129 kPa 0.08 m2 temperature. 30 °C (a) 4032 Pa (a) 273 K 260 Pa 293 K (a) 0 K (a) Answer depends 373 K on student. (a) and (b) Answer depends on student. A person is more likely to fall through an icy Pressure is inversely lake on tip-toes. proportional to The area of contact with volume. the ice is low, so the pressure on the ice will be As the volume of a high. gas increases, the particles will hit the 0.0005 m2 sides of a container less often so the pressure decreases. Gas Laws (p63 67) If a balloon is – Pressure is directly squeezed, the volume of proportional to When a particle is the air inside decreases. temperature (in Kelvin). heated, it vibrates. If it is Therefore, the pressure of As temperature heated enough, the the gas increases and the increases, the particles particle will vibrate enough balloon could burst. in the gas gain kinetic to break free from energy. surrounding particles. This 1.68 x 105 Pa Therefore, they collide turns a substance from a with the sides of the liquid to a gas. 899 Pa container more often and with more force. The particles in the air (a) This results in a are moving around all the pressure increase. time. When the air particles collide with the
(a) 75 Pa 8000 Pa 220 000 N 720 N 60 m2 3.5 m2 149 Pa 0.08 m2 (a) 4032 Pa 260 Pa (a) Answer depends on student. Answer depends on student. A person is more likely to fall through an icy lake on tip-toes. The area of contact with the ice is low, so the pressure on the ice will be high. 0.0005 m2 Gas Laws (p63 – 67) When a particle is heated, it vibrates. If it is heated enough, the particle will vibrate enough to break free from surrounding particles. This turns a substance from a liquid to a gas. The particles in the air are moving around all the time. When the air particles collide with the inside surface of the tyre, they impart a force and, therefore, a pressure is created. -273 °C is the temperature at which particles stop vibrating and so, as a result, it’s the coldest possible temperature. (a) 273 K 293 K 0 K 373 K (a) and (b) Pressure is directly proportional to temperature (in Kelvin). As temperature increases, the particles in the gas gain kinetic energy. Therefore, they collide with the sides of the container more often and with more force. This results in a pressure increase. As the tyre heats up during travel, the air particles inside will collide with the inside surface of the tyre more often and with more force. If the pressure gets too high, the tyre burst. 129 kPa 30 °C (a) Pressure is inversely proportional to volume. As the volume of a gas increases, the particles will hit the sides of a container less often so the pressure decreases. If a balloon is squeezed, the volume of the air inside decreases. Therefore, the pressure of the gas increases and the balloon could burst. 1.68 x 105 Pa 899 Pa (a)
Electricity-and-Energy-Problem-Booklet-St-Lukes.docx