Particle Model And Forces And Matter

Question 1

How do you calculate density?

Answer 1

Mass / volume

Question 2

Why are solids denser than liquids?

Answer 2

Particles in soils are closer together hence why ice floats in water

Question 3

What does the amount of thermal energy stored, depend on?

Answer 3

Temperature
Mass
Material it’s made from

Question 4

How does temperature affect particles?

Answer 4

Increase speed

Question 5

How do you maintain thermal energy?

Answer 5

The amount of energy that is transferred to surroundings must be reduced

Question 6

What happens from solid to gas for temperature?

Answer 6

Increases then stays constant as solid is melting.

Then rises as a liquid before it says constant as liquid is evaporating to create gas

Question 7

What is the temperature of a gas, a measure of?

Answer 7

The average kinetic energy of the particles in a gas

Question 8

What is absolute zero?

Answer 8

-273 degrees Celsius

Particles would literally not be moving

Question 9

What does an elastic object mean?

Answer 9

It will return to its original shape when forced are removed

Question 10

What is an inelastic object?

Answer 10

They will keep their new shape after forces are removed

Question 11

What is the extension of a spring?

Answer 11

The change in length when forces have been applied

Question 12

What kind of line is there on a graph when using metal spring?

Answer 12

Straight linear line - directly proportional

But bends slightly as the spring starts to become stretch too far

Question 13

What objects have nonlinear relationships?

Answer 13

Rubber bands e.t.c

Question 14

How do you calculate force (in springs)?

Answer 14

Force = spring constant x extension

Question 15

What is spring constant?

Answer 15

The force needed to produce an extension of 1 metre

Question 16

How to calculate energy transferred in stretching?

Answer 16

1
- X Spring constant x extension squared
2

Question 17

How do you calculate pressure?

Answer 17

Pressure (pa) = force /area

Question 18

When is pressure at its maximum?

Answer 18

At sea level as you have the sea pressure and atmosphere pressure

Question 19

Why do you feel double pressure underwater?

Answer 19

Water pressure and air as water is 800x denser than air

Question 20

Why do heavier blocks sink? (Float far down)

Answer 20

They need a great pressure beneath them to balance their weight and water has high pressure levels
The upthrust is equal to weight of water displaced