210 likes | 520 Views
Under Pressure http :// phet.colorado.edu/en/simulation/under-pressure by Trish Loeblein June 2012 modified by K Cook February 2013. Learning goals: Students will be able to Investigate how pressure changes in air and water. Discover how you can change pressure.
E N D
Under Pressurehttp://phet.colorado.edu/en/simulation/under-pressureby Trish Loeblein June 2012modified by K Cook February 2013 Learning goals: Students will be able to Investigate how pressure changes in air and water. Discover how you can change pressure. Predict pressure in a variety of situations
Directions: • Explore the simulation to find out how pressure changes in air and water. • Discover how you can change pressure in the simulation. • Go through the following slides as a guide and answer the questions. • Make your guess • Use the sim to check your guess • Go to the next slide to see if you got it right
1. Order from lowest to highest pressure. • A<B<C • C<B<A • all are equal
answer • A<B<C
2. Look at the markers. A.Order from lowest to highest pressure. B. Why (think about F &SA)? X A. Y<Z<X B. Y<X<Z C. Z<X<Y D. X<Z<Y E. two are equal Y Z
answer B. Y<X<Z Y is less force because only air above (less F less P) Z is most because even though same depth as X, it has less surface area (less SA more P)
3. What will happen to the pressure if more water is added?Is this related to force or surface area? • increase • decrease • stay the same
answer • increase because there is more force
4. What will happen to the pressure if more water is added while the same amount is removed? Why? • increase • decrease • stay the same
answer C. stay the same because force is the same
5. What will happen to the pressure if the fluid were changed to honey? Why? • increase • decrease • stay the same
answer • increase because more force
6. If a 250 kg mass was put on the water column, what will happen to the pressure? Why? • increase • decrease • stay the same
answer • increase because more mass leads to more force (there is more weight)
7. If the only change was to remove the air pressure , what will happen to the pressure? Why? • increase by 101.3 kPa • decrease by 101.3 kPa • stay the same • Something else
answer B. decrease by 101.3 kPa (If no air, then less force)
8. If the only change was to go to a place where the gravity was doubled, what will happen to the pressure? Why? • Both pressures would double • Only the air pressure would double • The air pressure would double, and the water pressure would increase some • Something else
answer • Both pressures would double because increased gravity acting on the mass of air AND water is increasing the weight (force) of both (more gravity more force more pressure
9. How do the pressures at the two locations compare? Why? • X>Y • Y>X • They are the same X Y
answer C. They are the same because it’s the surface area of the entire body of water and they are part of the same body of water