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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

16

couple

a pair of forces

17

power

work done per second

18

Hooke's law

extension is proportional to force f=kx

19

Ultimate tensile strength

maximum stress a material can take

20

impluse

change in momentum

21

Newton's first law

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

22

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

23

Newton's third law

each force has an equal and opposite reaction force

24

current

rate of flow of charge

25

potential difference

work done per unit charge

26

ohms law

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

27

Kirchoff's first law

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

28

Kirchoff's second law

the total emf around a series circuit = the sum of the p.d. across each component