Pressure in liquids worksheet|KS3 Physics|Teachit - Free Printable

Task 1: Pressure in Liquids

#### Part a)
We need to complete the sentences using the words provided in the box and add arrows to the beaker to show how water particles move.

Sentences:
1. "Everything, including liquids, are made up of tiny particles."
2. "The particles move around and as they do this they collide with the surfaces they come into contact with."
3. "The force of the particles hitting a surface causes pressure."
4. "Pressure comes from all directions."

Arrows on the Beaker:
- Draw arrows pointing outward from the sides and bottom of the beaker to indicate that pressure is exerted in all directions due to the movement and collisions of water particles.

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#### Part b)
The picture shows a flask full of water with a pump on top. The flask has holes in the bottom. Imagine the plunger was pushed down, draw the water coming out of the holes at the bottom, and then complete the sentence by crossing out the incorrect words.

Completed Sentences:
1. "The water comes out of all of the holes."
- Explanation: When the plunger is pushed down, it increases the pressure inside the flask, causing water to squirt out of all the holes.
2. "The water squirts out the same from each hole."
- Explanation: Since the pressure is uniform throughout the liquid, the water will squirt out with the same force from each hole.
3. "Pressure in liquids is the same in all directions."
- Explanation: Pressure in liquids is isotropic, meaning it acts equally in all directions.

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#### Part 3
This flask is filled with water and has three spouts on one side, labeled 1, 2, and 3. Answer the following questions:

a) Which spout is deepest?
- Spout 3 is the deepest because it is located at the bottom of the flask.

b) Which spout do you think the water will come out of the fastest?
- The water will come out of spout 3 the fastest. This is because the pressure at the bottom of the flask (spout 3) is the greatest due to the depth of the water column above it.

c) Draw on the diagram what you think the water coming out of each spout will look like.
- Draw the water squirting out of spout 1 with the least force, spout 2 with more force, and spout 3 with the most force. The streams should get wider and weaker as they move away from the flask.

d) What is the rule here? Cross out the incorrect word.
- "Pressure in liquids increases with depth."
- Explanation: Pressure in a liquid increases with depth because the weight of the water above a given point increases as you go deeper.

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Final Answers:

1. Part a:
- Sentences completed with: particles, collide, surfaces, pressure, directions.
- Arrows drawn outward from the beaker.

2. Part b:
- The water comes out of all of the holes.
- The water squirts out the same from each hole.
- Pressure in liquids is the same in all directions.

3. Part 3:
- a) Spout 3 is the deepest.
- b) The water will come out of spout 3 the fastest.
- c) Draw the water streams with increasing force from spout 1 to spout 3.
- d) Pressure in liquids increases with depth.

Final Boxed Answer:

\[
\boxed{
\text{a) particles, collide, surfaces, pressure, directions} \\
\text{b) all, same, liquids, same} \\
\text{3) a) 3, b) 3, c) Draw streams with increasing force, d) increases}
}
\]