Pressure-Force-Area.pptx

physics

1. Pressure LO: To be able to calculate pressure and explain what causes it to change. Keywords: Pressure, Force, Area Do Now: Why does hitting a balloon not pop it but hitting it with a pin does?

2. Success Criteria I can name what affects pressure. I can calculate pressure . I can explain what affects pressure. I can rearrange the pressure equation. I can explain how force and area affects pressure.

3. Sooooooooo ???????

4. Pressure is exerted whenever a force is applied over an area. If the same force is applied in each picture, which arm exerts the highest pressure on the board? 1. 2. What is pressure?

5. Pressure Two things affect pressure: Force Area

6. Pressure Pressure = Force Area Look at the equation. How could you increase the pressure? Increase Force Decrease Area

7. How much pressure do you make?

8. Explain how each of the objects you drew either increases or decreases the pressure. Explain how force affects pressure. 1. a . Draw and describe an object that is designed to decrease pressure. b. Draw and describe an object that is designed to increase pressure. Snow boards have two features which use pressure a large flat base and sharp edges. Explain how these features help the snowboarder.

9. Explain how each of the objects you drew either increases or decreases the pressure. 1. a . Draw and describe an object that is designed to decrease pressure. b. Draw and describe an object that is designed to increase pressure. Snow boards have two features which use pressure a large flat base and sharp edges. Explain how these features help the snowboarder. Peer Assess: You can describe how pressure is affected area. You can explain how area affects pressure. You can apply your understanding of pressure to different concepts. Next Step: Calculating Pressure.

10. How can he do this??! Talk for 1 minute with your partner and try to come up with an explanation. Pressure

11. Success Criteria I can name what affects pressure. I can calculate pressure . I can explain what affects pressure. I can rearrange the pressure equation. I can explain how force and area affects pressure.

12. Pressure Pressure = Force Area Look at the equation. How could you increase the pressure? Increase Force Decrease Area

13. Calculating Pressure: A force of 500 N acts over an area of 10 m 2 . (Unit: N/m 2 ) A hammer hits a nail with a force of 50 N into some wood. The area of the point of the nail is 0.02cm 2 . (Unit: N/cm 2 ) A girl has a weight of 450 N and her feet have a total area of 300 cm 2 . (Unit: ???????) ASPIRE: Thinkers: A car of weight 6,400 N has four wheels. Each wheel has an area of 80 cm 2 touching the road. Find the pressure the car puts on the ground . A bridge will break if the material it is made of exceeds a pressure of 500N/m 2 . An elephant stands on the bridge. It has a mass of 500kg and the area of all its feet is 4m. Does the bridge break? A pressure of 50N/m 2 is exerted on a stamp of 1 cm by 1c stamp. What is the force applied? Rearranging: A student uses a glue stick with an area of 4 cm 2 , putting a pressure of 0.5 N/cm 2 on her book. Calculate the force she puts on the glue stick. A box puts a pressure of 50 N/m 2 on an area of 0.25 m 2 . Find the force of the box on the floor. Calculate the area of a dart which hits the dartboard with a force of 10 N and pressure of 2000 N/cm2.

14. Success Criteria I can name what affects pressure. I can calculate pressure . I can explain what affects pressure. I can rearrange the pressure equation. I can explain how force and area affects pressure.

15. Whiteboards: True / False Pressure can be measured in N / cm 2 or N/m 2 or Pascals . Pressure depends on force only 1 Pascal = 1N/cm 2 A needle exerts a low pressure when someone is injected ASPIRE Who is more likely to break the bridge? Be ready to explain your answer