## ← Back to Science Chapter 7

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### 6 Multiple choice questions

1. The upward force that fluids exert on all matter. Buoyant Force is caused by differences in fluid pressure.
2. A change in pressure at any point in an enclosed fluid will be transmitted equally to all parts of that fluid. Uses and examples: brakes, power, lifters, etc. Liquids are best used in hydraulic devices because they cannot be compressed into smaller spaces like gases can.
3. Pressure caused by the weight of the atmosphere. Earth's atmosphere is held in place by gravity. Although we don't feel this pressure because the fluids in our body exert an equal outward pressure. The closer you are to Earth's surface you are, the greater the pressure because you are "deep" in the atmosphere.
4. Moving forwards comes from the engine.
5. The amount of matter in a certain volume. Water is more dense than air; and therefore, it exerts more pressure.
6. All fluids exert pressure. Pressure is created by the particles in a fluid pushing against each other and the sides of whatever container they are in. Fluids exert pressure equally in all directions.

### 6 True/False questions

1. DragThis comes from air resistance.

2. Plane's and their pressureThe wing shape on a plane os what causes different speed of air, which affects pressure. The air that foes over the wing must travel faster than the wing to meet up at the end. This creates less pressure above the wing compared to below which creates lift.

3. PascalThe metric (SI) unit for pressure. Abbreviation: Pa.

4. PressurePressure only depends on the depth of the fluid, not the total amount present.

5. PressureBecause pressure increases with depth, the pressure on the bottom of the object is greater that n the pressure on the top. Therefore, there is a net upward force on the object.

6. Fluid behaviorAll fluids exert pressure. Pressure is created by the particles in a fluid pushing against each other and the sides of whatever container they are in. Fluids exert pressure equally in all directions.

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