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Flashcards in Study notes physci 105 less death Deck (38):
1

Acceleration

Change in velocity(accel, decel, direction)

2

speed

measure of how fast something is moving

3

instantaneous speed

speed at a specified instant

4

velocity

both speed and direction

5

force

push or pull

6

net force

sum of all forces

7

weight

downward pull on an object resulting from gravity

8

average speed

distance during a period of time

9

Formula for acceleration

V(bar)=(Vf-Vi)/t

10

four fundamental forces

Gravity, Electromagnetic forces, Weak nuclear strong nuclear

11

accel of Gravity (g)

32 ft/s^2 or (9.8 m/s^2)

12

newtons 1st law of motion

(inertia) an object in motion tends to stay in motion inversely an object at rest tends to stay at rest

13

newtons 2nd law of motion

the acceleration of an object is directly proportional to the net force acting on it and inversly proportional to the mass of the object

14

newton defined in terms of what unit

mass: measured in kg, and acceleration: measured in m/s^2

15

mass is directly proportional to what?

inertia

16

formula for force

F=ma

17

what are the units of force (weight)

lb and newton

18

what are units of mass

kg

19

newtons 3rd law of motion

whenever 2 objects interact the force exerted on one object is equal in size and oposite in directiokn to the force exerted on the other object

20

formula for momentum

p=mv (momentum=mass*velocity)

21

universal law of gravitation

every object in the universe in attracted to every other object with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distances between them (F=G*((m1*m2)/d^2)))

22

momentum

product of an objects mass and velocity

23

law of conservation of momentum

momentum always remains the same

24

impulse

change of momentum equal to a force times the time of application (delta)p= ft

25

centripetal force

force that pulls an object out of its stright line path

26

formula for period

T= 1/f

27

formula for speed

v(bar)= d/t

28

formula for average velosity

a=(Vf-Vi)/t

29

formula for velocity

(lambda)f -----wavelength* frequency

30

amplitude

max value of dispacement of a vibration

31

frequency

max number of vibrations in a second

32

hertz

the unit of frequency

33

waves

traveling vibrations or disturbances in a medium

34

transverse waves

particles move perpendicular to movement of wave

35

longitudinal wave

particles move parellel to movement of wave

36

sound (what kind of wave?)

longitudinal wave

37

disturbances of a wave are called?

condensations (crests) and rarefactions (troughs)

38

audible sounds

between 20-20000 Hz