physics midterm

Question 1

vf

Answer 1

Vo + at

Question 2

change in X

Answer 2

Vot + .5at^

Question 3

Vf^

Answer 3

Vo^ + 2aX

Question 4

calculate how fast an object free falls

Answer 4

v=g x t

Question 5

object droped

height=

Answer 5

.5gt^

Question 6

projectile

Answer 6

only force is gravity

Question 7

horizontal component

Answer 7

no acceleration gravity has no effect

d=vt

Question 8

vertical component

Answer 8

acceleration is 10
use all formulas

to find time y=.5gt^

Question 9

angled launches

Answer 9

at max hieght
velocity of horizontal and vertical is the same

speed is equal at equal heights

Question 10

newton’s first law

Answer 10

object at rest will stay at rest unless outside force

Question 11

2nd law

Answer 11

force= mass x acceleration

Question 12

3rd law

Answer 12

every action has an equal or opposite reaction

force pairs

object cannot create a force alone

Question 13

unit of length

Answer 13

meter

Question 14

unit of mass

Answer 14

kilograms

Question 15

unit of time

Answer 15

seconds

Question 16

velocity

Answer 16

length/time

Question 17

acceleration

Answer 17

length/time^

Question 18

x=

Answer 18

.5at^

Question 19

acceleration towards the center of motion

Answer 19

a= v^/r

Question 20

significant figures

Answer 20

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

Question 21

dynamics

Answer 21

study of motion

Question 22

kinematics

Answer 22

part of dynamics that describes motion
not causes

displacement
velocity
acceleration

Question 23

displacement

Answer 23

change in position
Xf-Xi

negative direction or positive direction

vector: magnitude n direction

Question 24

scalar quantity

Answer 24

magnitude no direction
mass
temp
speed

Question 25

average speed

Answer 25

total length/total time includes distance use distance formula always positive scalar

Question 26

average velocity

Answer 26

displacement use formula: Xf-Xi vector

Question 27

position v time graph

Answer 27

curve: velocity straight: constant velocity if curved then just find straight line btw 2 points

Question 28

instanteous velocity

Answer 28

tangent line

Question 29

acceleration

Answer 29

change in velocity | directly proportional to net force

Question 30

average accel

Answer 30

change in v/ change in t vector nonzero accel when v is zero: toss a ball up

Question 31

velocity v time graph

Answer 31

slope of tangent at that point= instantanous accel= accel

Question 32

inertia

Answer 32

tendency to continue original state of motion

Question 33

mass

Answer 33

measure of object's resistance to changes in motion due to force greater mass, less accel

Question 34

gravitational force

Answer 34

attraction btw two objects G x m1m2 r^ r: distance btw object

Question 35

universial gravitational constant

Answer 35

6.67 x 10^-11

Question 36

weight force

Answer 36

G x Me m | r^

Question 37

forces

Answer 37

F=f accel=0 F is bigger, object accelerates in that direction

Question 38

how to find max static friction | and kinetic friction

Answer 38

f=un

Question 39

mechanical energy

Answer 39

sum of KE and PE

Question 40

work

Answer 40

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

Question 41

work when force is at an angle

Answer 41

W= (Fcos@)d d= always positive negative/positive work depends on cos@

Question 42

work net

Answer 42

KEf-KEi + answe:

Question 43

KE

Answer 43

.5mv^ joules mass moving scalar can do work on another object

Question 44

conservative force

Answer 44

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

Question 45

nonconservative force

Answer 45

energy disperse as heat/sound

Question 46

potential energy

Answer 46

from conservative forces present at the beginning and end points of a curve composed of systems

Question 47

work with gravity

Answer 47

Fdcos@

Question 48

GPE

Answer 48

mgy

Question 49

total mechanical energy conserved

Answer 49

KEi + PEi = KEf + PEf

Question 50

power average

Answer 50

rate at which energy is transferred w/t

Question 51

instantaneous power

Answer 51

Fu force n velocity is parralel