Physics

Question 1

Newtons first law

Answer 1

rest (motion) stays at rest (motion) unless acted on by outside force. Have constant velocity

Question 2

Newtons second law

Answer 2

F=MA, net force changes velocity

Question 3

Newtons third law

Answer 3

every action has a equal and opposite reaction

Question 4

Energy

Answer 4

ability to do work

Question 5

Work

Answer 5

energy transferred by force

Question 6

Conservative forces

Answer 6

work done by force depends on final position… path independent (includes gravity and spring)

Question 7

Power

Answer 7

Rate that work is done (P=W/t)

Question 8

Vector

Answer 8

magnitude and direction

Question 9

Scalar

Answer 9

only magnitude

Question 10

instantaneous

Answer 10

at a certain moment in time

Question 11

instantaneous velocity

Answer 11

speed and direction at a moment, slope on distance vs. time graph

Question 12

VT graph

Answer 12

area= distance, slope= acceleration

Question 13

What is the speed of sound based on

Answer 13

stiffness and density, V solids> liquids> gas

Question 14

Ohms Law

Answer 14

V=IR

Question 15

Resistors in series

Answer 15

I1=I2, Vtotal= V1 + V2, Rtot= R1 +R2

Question 16

Resistors in parallel

Answer 16

I= I1 + I2, 1/R tot= 1/R1 + 1/R2, V1=V2= V3

Question 17

What affects resistance

Answer 17

R= rho (L/A) where Rho= resistivity, R decreases as area increases and length decreases

Question 18

Ammeter

Answer 18

measures current, must be in series and have low resistance

Question 19

voltmeter

Answer 19

hook up in parallel, use high resistance

Question 20

Capacitor

Answer 20

stores charges and electrical potential energy

Question 21

Capacitor in series

Answer 21

Q1= Q2, 1/Ceq= 1/C1 + 1/C2, V/Q=1/Ceq

Question 22

Capacitor in parallel

Answer 22

Ceq= C1+ C2… Vtot=V1 +V2

Question 23

What affects capacitance

Answer 23

dielectric increases capacitance. (Decrease voltage between plates) C’=kC

Question 24

Potential difference

Answer 24

PE= Ue=qv, V= kQ/r

Question 25

velocity

Answer 25

displacement over time

Question 26

d v. time

Answer 26

slope is IV

Question 27

v v. time

Answer 27

slope is IA, area above zero is distance, area below zero is displacement

Question 28

bouyant force

Answer 28

force by fluid on object, pressure increases as depth increases and Force increases, when further from SA have upward force

Question 29

What causes bouyancy

Answer 29

difference in pressure. Fb magnitude= weight of displaced fluid

Question 30

hydrophobic effect

Answer 30

when hydrophobic is closer together, less water is orderly at hydrophillic, decreases size of ordered layer of water so entropy increases

Question 31

sublimation

Answer 31

solid to gas

Question 32

Hess law

Answer 32

independent of path. Delta H=Hp- Hr

Question 33

Pascals

Answer 33

n/ m ^2

Question 34

volumetric flow rate

Answer 34

Q=Velocity * area

Question 35

photoelectric effect

Answer 35

when lights strikes a material, electrons can be ejected due to energy absorption (if higher than Ionization threshold)

Question 36

What does bernoulis equation show

Answer 36

in horizontal flow, higher fluid speed will have less pressure than points of slower fluid

Question 37

Venturi effect

Answer 37

water flowers faster through constricted area (volume flow rate is same, but faster) - lower pressure but faster

Question 38

current

Answer 38

charge over time

Question 39

archimedes principle

Answer 39

bouyant force against a fluid is equal to the weight of displaced fluid

Question 40

guage pressure

Answer 40

absolute pressure- atmospheric pressure