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- 1. Pressure calculations IF THE UNITS IN THE QUESTIONS ARE N/M2 THEN THE ANSWER MUST BE IN THAT UNIT ALSO. DO NOT GET MIXED UP WITH N/CM2. Please show your working out in your exercise books. 1. Calculate the pressure exerted by a 1000N elephant when standing on the floor if his feet have a total area of 5cm2. 2. A brick is rested on a surface. The brick has an area of 20cm2. Its weight is 5N. Calculate the pressure. 3. A woman exerts a pressure of 100N/cm2 when standing on the floor. If her weight is 700N what is the area of the floor she is standing on? 4. The pressure due to the atmosphere is 100,000N/m2. If 10 Newtons are equivalent to 1kg how much mass is pressing down on every square centimetre of our body? 5. What are the units of:- • pressure • force • area 6. A force of 800 N acts over an area of 10 m2. What pressure is created by this force? 7. A girl of weight 800 N has feet of area 100 cm2. What pressure does she put on the ground? 2 8. A car of weight of 400 N has four wheels. Each wheel has an area of 80 cm . What pressure does the car put on the ground? 2 9. A force of 500 N creates a pressure of 4 N/m . Over what area is the force acting? 2 10. A pressure of 200 Pa is created over an area of 5 m . What force acts to create this pressure? 2 11. A tractor has tyres of area 3 m . It has a weight of 12 000 N. What pressure does the tractor put on the ground? 2 12. A truck has tyres of area 5 m2. It puts a pressure of 15 000 N/m on the road. What is the weight of the truck?