material (such as foil) to substance from a liquid to Therefore, they collide prevent heat loss. a gas. with the sides of the container more often Pressure (p61 62) The particles in the air are and with more force. – moving around all the This results in a Pressure is the force time. When the air pressure increase. applied to an area of a particles collide with the surface. inside surface of the tyre, As the tyre heats up during they impart a force and, travel, the air particles (a) 75 Pa therefore, a pressure is inside will collide with the 8000 Pa created. inside surface of the tyre 220 000 N more often and with more 720 N -273 °C is the temperature force. 60 m2 at which particles stop If the pressure gets too 3.5 m2 vibrating and so, as a high, the tyre could burst. result, it’s the coldest 149 Pa possible temperature. 129 kPa 0.08 m2 (a) 273 K 30 °C 293 K (a) 4032 Pa 0 K (a) 260 Pa 373 K (a) Answer depends on (a) and (b) student. Answer depends on student. A person is more likely to fall through an icy lake on Pressure is inversely 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. Pressure is directly Gas Laws (p63 67) If a balloon is squeezed, – proportional to the volume of the air inside temperature (in Kelvin). When a particle is heated, decreases. Therefore, the As temperature it vibrates. If it is heated pressure of the gas increases, the particles enough, the particle will increases and the balloon in the gas gain kinetic vibrate enough to break could burst. energy. free from surrounding particles. This turns a 1.68 x 105 Pa
material (such as foil) to prevent heat loss. Pressure (p61 – 62) Pressure is the force applied to an area of a surface. (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 could 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
Electricity-and-Energy-Problem-Booklet-sbu8z8.docx