Flashcards in key terms Deck (28)

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1

## speed

### How fast something is moving regardless of direction

2

## Displacement(s)

### How far an object has travelled from it's starting point in a given direction

3

## velocity(v)

### The rate of change of an objects displacement

4

## Acceleration(a)

### The rate of change of an objects velocity

5

## Free fall

### the motion of an object undergoing an acceleration of g

6

## Transverse waves

### vibration is at a right angle to the direction of travel

7

## longitudinal waves

### Vibrations are along the direction of travel

8

## stopping distance

### thinking distance + braking distance

9

## Galileo said...

### all objects fall at the same rate (if you ignore air resistance)

10

## friction

### a force that opposes motion

11

## Terminal velocity

### when the friction force equals the driving force

12

## density

### mass per unit volume

13

## pressure

### force per unit area

14

## Archimedes principle

### when a body is partially or completely immersed in a fluid, it experiences an upthrust equal to the weight of fluid it has displaced.

15

## moment

### turning effect of a force

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## couple

### a pair of forces

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## power

### work done per second

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## Hooke's law

### extension is proportional to force f=kx

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## Ultimate tensile strength

### maximum stress a material can take

20

## impluse

### change in momentum

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## Newton's first law

### Velocity of an object will not change unless a net force is acts on it

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## Newton's second law

### The rate of change of momentum of an object is directly proportional to the net force that acts on the object. f=ma

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## Newton's third law

### each force has an equal and opposite reaction force

24

## current

### rate of flow of charge

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## potential difference

### work done per unit charge

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## ohms law

### if temperature is constant, the current through an ohmic conductor is directly proportional to the p.d. across it

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## Kirchoff's first law

### the total current entering a junction = the total current leaving it

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