Last Week! What Happens When You Mix Oil and Water?

Name: ______

Science Bus Lesson 8

Hydraulics

Last Week! What happens when you mix oil and water?

Question of the day: How can we move things with water?

1.  Connect two syringes of the same size and a short length of tubing underwater. Have both plungers all the way in.

a.  What do you think will happen when you try to pull either plunger out?

b.  Try it. Were you right?

c.  Why do you think this happened?

2.  This time make sure one plunger is filled with water and the other is in, as in the diagram.

a.  Try pushing in plunger A. What happened?

b.  Now try pulling plunger A out again. What happened?

c.  When you pushed one plunger in, the other plunger moved in the opposite direction. True or False?

d.  Bend the tube. How does this affect how the plunger moves?

e.  Take off one syringe and fill it with 5 ml of water. Push the other plunger all the way in and connect the two syringes with tubing. Now push the 5 ml of water out of the syringe into the other syringe. How much water goes into the other syringe? Explain your answer.

3.  This time connect a medium and a small syringe together using a short length of tubing. Have the small syringe fully filed with water and the large syringe pushed in.

Push in the small syringe plunger.

a.  Is the amount of water that goes into the large syringe the same amount that was in the small one? Yes or No

Push the water into the small syringe.

When you push the water back into the small syringe, watch how far the small syringe plunger moves compared to how far the large syringe moved.

b.  Which one moves farther? Large or Small

c.  Fill in this sentence:

To move a plunger the farthest distance, have the ______

syringe move water to the ______syringe.

4.  Have the water in the small syringe.

a.  Hold your thumb over the top of the large syringe plunger See if you can keep the large plunger all the way down easily as you push the water out of the small syringe.

b.  Now push the water out of the large syringe as you hold your thumb over the small syringe.

c.  Which plunger was harder to keep all the way down? Large or Small

d.  When you want to push with a lot of force, have the ______syringe move water into the ______syringe.

e.  When you want to push something a long distance, have the ______syringe move water into the ______syringe.