Flashcards in Definitions Deck (30):

1

## absolute zero

### the temperature at which substance has minimum ener

2

## specific heat capacity

### energy required to raise the temperature of a unit mass of a substance by unit temperature

3

## thermal equilibrium

### if there is no net heat transfer between two objects

4

## latent heat of vaporisation

### the energy required to change a liquid into a gas at a constant temperature

5

## latent heat of fusion

### the energy required to change a solid to a liquid at a constant temperature

6

## internal energy

### sum of the random kinetic energy and potential energy of molecules in a substance

7

## assumptions of the kinetic model of ideal gases

###
1. elastic collisions with the walls of the container

2. forces between molecules are negligible except during collisions

3. time of collisions much compared to the time between molecules

4. volume of molecules is negligible compared to volume of container

8

## Boyle's law

### pressure is inversely proportional to volume for a fixed mass of gas at a constant temperature

9

## mole of a substance

### 6.02x10^23 particles of the substance

10

## Newton's first law

### a body will remain at rest or continue to move with constant velocity unless acted on by a force

11

## Newton's second law

### the rate of change of momentum is proportional to the net force acting on it in the direction of the force

12

## Newton's third law

### when one body exerts a force on another body the other body exerts an equal and opposite force on the first body

13

## linear momentum

### mass x velocity

14

## principle of conservation of linear momentum

### total momentum is conserved for a closed system

15

## elastic collision

### kinetic energy is conserved

16

## inelastic collision

### where there is some loss of kinetic energy in a collision

17

## impulse of a force

### force x time for which the force acts

18

## gravitational field strength

### force per unit mass at a point in a gravitational field

19

## Newton's law of gravitation

### gravitational force between two masses is proportional to the product of the masses and inversely proportional to the square of the distance between them

20

## Kepler's third law

### the cube of the distance from the planet to the sun divided by the orbital period squared is the same for all planet's

21

## conditions for circular motion

### resultant force acts perpendicular to he velocity

22

## geostationary orbit

### an equatorial orbit with a period equal to the rotation period of the earth and in the same direction of the earths rotation

23

## radian

### 53.7 degrees

24

## simple harmonic motion

###
11. acceleration is proportional to the displacement

2.acceleration is directed in the opposite direction the displacement

25

## displacement in simple harmonic motion

### distance of a body from its equilibrium position

26

## amplitude

### maximum displacement

27

## frequency

### the number of oscillations per second

28

## angular frequency

### measure of the tangential frequency of oscillations

29

## phase difference

### an angular measurement of how much one oscillation lags or leads another

30