Flashcards in G484 Definitions Deck (27):

1

## Newton's 1st Law

### An object will remain at rest or keep travelling at a constant velocity unless it is acted on by an external force.

2

## Newton's 2nd Law

### The net force acting on an object is equal to the rate of change of momentum. The net force and the change in momentum are in the same direction.

3

## Newton's 3rd Law

###
When two bodies interact they exert equal and opposite forces of the same kind on each other.

4

## Linear Momentum

### The product of an objects mass and its velocity.

5

## Net Force

### The resultant of all the forces acting on an object.

6

## Impulse of a Force

### The product of a force and the time for which it acts.

7

## Conservation of Momentum

### In a closed system, when bodies interact, the total momentum in any specified direction remains the same.

8

## Perfectly Elastic Collision

### A collision in which kinetic energy is conserved (momentum and total energy always conserved).

9

## Inelastic Collision

### A collision in which kinetic energy is not conserved (momentum and total energy are conserved).

10

## Radian

### The angle subtended at the centre of a circle when the arc length is equal to the radius. Pi radians equals 180 degrees.

11

## Gravitational Field Strength

### The gravitational force per unit mass.

12

## Newton's Law of Gravitation

### Any two point masses attract each other with a force that is directly proportional to the product of their masses and inversely proportional to the square of their separation.

13

## Period

### The time taken by an object to complete one orbit or for one complete oscillation by a vibrating object.

14

## Geostationary Orbit

### The orbit of a satellite which has a period of one day and is in the equatorial plane.

15

## Simple Harmonic Motion

### Motion of an oscillator where acceleration is directly proportional to the displacement and is directed towards the equilibrium position.

16

## Displacement (in terms of shm)

### Distance from the equilibrium position, can be positive or negative.

17

## Amplitude

### Magnitude of the maximum displacement from the equilibrium position.

18

## Frequency

### The number of oscillations per unit time.

19

## Angular Frequency

### The rate of change of an angle expressed in radians per second.

20

## Phase Difference

### The fraction of an oscillation between the vibrations of two oscillating particles, expressed in degrees or radians.

21

## Pressure

### Force per unit area

22

## Internal Energy

### The sum of the random distribution of kinetic and potential energies of all the atoms/molecules in a system.

23

## Absolute Zero

### The temperature at which a system has minimum internal energy: equivalent to -273.15oC

24

## Specific Heat Capacity

### The energy required per unit mass of a substance to raise its temperature by 1K.

25

## Boyle's Law

### The pressure exerted by a fixed mass of gas is inversely proportional to its volume, provided the temperature of the gas remains constant.

26

## Kepler's 3rd Law

### The period of a planet orbiting the Sun squared is proportional to the mean radius cubed.

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