Unit A: Section 3.0 Flashcards Preview

Grade 8: Science > Unit A: Section 3.0 > Flashcards

Flashcards in Unit A: Section 3.0 Deck (26):
1

What affects a flow rate?

How thick or thin it is and the viscosity

2

What determines the viscosity of a substance?

The internal resistance or friction between the particles

3

What factor has an affect on viscosity?

Temperature

4

How can viscosity be measured?

Using the ramp test

5

What is density?

The amount of matter in a given volume

6

What density of a substance depend on?

It depends on the particles of a substance and wether it is a solid liquid or gas

7

What is the formula for density?

Density (d) = mass (m) / volume (v)

8

Why can ships float?

Because they contain a large quantity of air and the average density of everything is lighter than the density of water

9

Density does not change?

Density does not change as long as the temperature stays the sane

10

If you hear up substance the density changes because?

As energy is added the particles move quickly and farther apart, thus increasing the volume. The density increases because mass remains constant but the volume increases

11

What is buoyancy?

It is the tend act of a substance to float

12

Why do buoyant objects float?

They take up space in a fluid, pushing some of it away of displacing it causing them to float, because the fluid pushes back against the force of gravity

13

What is the buoyant force?

The buoyant force pushes objects upward

14

What is a flow rate?

How quickly a fluid can flow

15

What is force?

It is s push if pull of an object, and is measured in Newtons (N)

16

What is a plimsoll line?

It shows how heavily a ship can be loaded in different weather conditions

17

How do hot air balloons work?

As the air inside the balloon is heated, it becomes less dense than the surrounding air. The buoyant force of the air will push the hot air balloon upwards, until the buoyant force equals the force of gravity.

18

What is the unit used for mass?

Grams

19

What is the unit used for volume?

cm3

20

What is the unit used for density?

g/cm3

21

What is pressure measured in?

Pascals

22

What is the formula for pressure?

Pressure (P)= force (N)/ area (M2)

23

How does drinking out of a straw work?

When we suck on the straw that lessens the pressure on the outside and increases the pressure on the inside

24

What does Pascals law say?

An enclosed fluid transmits pressure in all directions equally

25

What is a pneumatic device?

It is a pressure system that uses air instead of Water

26

What is a hydraulic device?

It is a pressure system that uses water instead of air