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12th grade > physics midterm > Flashcards

physics midterm Flashcards

1
Q

vf

A

Vo + at

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2
Q

change in X

A

Vot + .5at^

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3
Q

Vf^

A

Vo^ + 2aX

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4
Q

calculate how fast an object free falls

A

v=g x t

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5
Q

object droped

height=

A

.5gt^

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6
Q

projectile

A

only force is gravity

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7
Q

horizontal component

A

no acceleration gravity has no effect

d=vt

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8
Q

vertical component

A

acceleration is 10
use all formulas

to find time y=.5gt^

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9
Q

angled launches

A

at max hieght
velocity of horizontal and vertical is the same

speed is equal at equal heights

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10
Q

newton’s first law

A

object at rest will stay at rest unless outside force

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11
Q

2nd law

A

force= mass x acceleration

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12
Q

3rd law

A

every action has an equal or opposite reaction

force pairs

object cannot create a force alone

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13
Q

unit of length

A

meter

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14
Q

unit of mass

A

kilograms

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15
Q

unit of time

A

seconds

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16
Q

velocity

A

length/time

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17
Q

acceleration

A

length/time^

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18
Q

x=

A

.5at^

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19
Q

acceleration towards the center of motion

A

a= v^/r

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20
Q

significant figures

A

multiply: answer same number of SF as the lowest # of SI
add: number of decimal places in the answer is equal to the smallest number of deconmal places

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21
Q

dynamics

A

study of motion

22
Q

kinematics

A

part of dynamics that describes motion
not causes

displacement
velocity
acceleration

23
Q

displacement

A

change in position
Xf-Xi

negative direction or positive direction

vector: magnitude n direction

24
Q

scalar quantity

A

magnitude no direction
mass
temp
speed

25
Q

average speed

A

total length/total time
includes distance

use distance formula

always positive
scalar

26
Q

average velocity

A

displacement

use formula: Xf-Xi

vector

27
Q

position v time graph

A

curve: velocity
straight: constant velocity

if curved then just find straight line btw 2 points

28
Q

instanteous velocity

A

tangent line

29
Q

acceleration

A

change in velocity

directly proportional to net force

30
Q

average accel

A

change in v/ change in t

vector

nonzero accel when v is zero: toss a ball up

31
Q

velocity v time graph

A

slope of tangent at that point= instantanous accel= accel

32
Q

inertia

A

tendency to continue original state of motion

33
Q

mass

A

measure of object’s resistance to changes in motion due to force

greater mass, less accel

34
Q

gravitational force

A

attraction btw two objects

G x m1m2
r^

r: distance btw object

35
Q

universial gravitational constant

A

6.67 x 10^-11

36
Q

weight force

A

G x Me m

r^

37
Q

forces

A

F=f
accel=0

F is bigger, object accelerates in that direction

38
Q

how to find max static friction

and kinetic friction

A

f=un

39
Q

mechanical energy

A

sum of KE and PE

40
Q

work

A

done only when object is moved through displacement while force is applied. when force or displacement double, work is doubled. double both: quadriple work

W=Fd

force is parallel to displacement

joules

if negative, object loses mechanicle energy

scalar

41
Q

work when force is at an angle

A

W= (Fcos@)d

d= always positive
negative/positive work depends on cos@

42
Q

work net

A

KEf-KEi

+ answe:

43
Q

KE

A

.5mv^ joules

mass moving
scalar

can do work on another object

44
Q

conservative force

A

gravity
energy put in same as energy get out

if work it does moving an object btw two points is the same no matter that path

45
Q

nonconservative force

A

energy disperse as heat/sound

46
Q

potential energy

A

from conservative forces

present at the beginning and end points of a curve

composed of systems

47
Q

work with gravity

A

Fdcos@

48
Q

GPE

A

mgy

49
Q

total mechanical energy conserved

A

KEi + PEi = KEf + PEf

50
Q

power average

A

rate at which energy is transferred

w/t

51
Q

instantaneous power

A

Fu

force n velocity is parralel

12th grade (39 decks)

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