kinematics, force, and work

Question 1

what is electric current?

Answer 1

definition: describes the flow of charge in coulombs per second
unit: ampere (A)

Question 2

what is the temperature conversion from celcius to Kelvin?

Answer 2

273.15+ temp in celcius

Question 3

factor of 10 given by the prefix deca?

Answer 3

10E1

Question 4

factor of 10 given by the prefix hecto

Answer 4

10E2

Question 5

factor of 10 given by the prefix deci

Answer 5

10E-1

Question 6

factor of 10 given by the prefix centi

Answer 6

10E-2

Question 7

factor of 10 given by the prefix milli

Answer 7

10E-3

Question 8

factor of 10 given by the prefix micro

Answer 8

10E-6

Question 9

factor of 10 given by the prefix nano?

Answer 9

10E-9

Question 10

factor of 10 given by the prefix pico?

Answer 10

10E-12

Question 11

what is the derived unit for Force

Answer 11

Kg*m/s^2

Question 12

what are the units for frequency (SI and derived)

Answer 12

Hertz (Hz)
s^-1

Question 13

what are the units for pressure (SI and derived)

Answer 13

pascals (Pa)
N/m^2

Question 14

what are the units for energy/ work

Answer 14

Joule (j)
N*m

Question 15

what is the SI base unit of electron volt (eV)

Answer 15

1.6E-19 J

Question 16

what are the units of power

Answer 16

Watts (W)
J/s

Question 17

what are the units of electrical charge

Answer 17

coulombs (C)
s*A

Question 18

what are the units of electrical potential

Answer 18

Volt (V) also W/A

Question 19

what are the units of capacitance

Answer 19

Farads (F)
derived from C/V

Question 20

what are the units of resistance

Answer 20

ohms
derived from V/A

Question 21

what are the units of magnetic field

Answer 21

Tesla (T) derived from Wb/m^2

Question 22

definition of a vector

Answer 22

quantity with magnitude and direction
- typically have x and y components

Question 23

definition of a scalar

Answer 23

quantity with only magnitude

Question 24

cos(30)

Answer 24

sqr(3)/2

Question 25

cos60

Answer 25

1/2

Question 26

displacement

Answer 26

vector quantity of distance. path independent and is determined by the change in location from starting point. walking in a circle would result in a displacement of zero.

Question 27

velocity

Answer 27

displacement over time. units: m/s

Question 28

acceleration

Answer 28

velocity over time units: m/s^2 or V/t

Question 29

if you have a positive velocity how would you interpret if the acceleration was.. A. positive B. zero c. negative

Answer 29

A. the object is moving up and speeding up more and more B. the object is moving up at constant speed C. object is moving upward and slowing down

Question 30

if you have a 0 velocity how would you interpret if the acceleration was... A. positive B. zero C. negative

Answer 30

A. object is beginning to move upward from rest , or is moving from downward to upward B. object is not moving c. object is beginning to move downward from rest

Question 31

if you have a negative velocity how would you interpret if acceleration was.. A. positive B. zero C. negative

Answer 31

A. object is moving downward and slowing down B. object is moving downward at a constant speed C. object is moving downward and speeding up

Question 32

what does the slope of a displacement vs time graph represent

Answer 32

velocity. the steepness indicates speed - upward and downward indicate direction

Question 33

what does the area under the curve of an acceleration vs time graph represent?

Answer 33

velocity 1/2(b*h)

Question 34

major assumption for kinematic problems on MCAT?

Answer 34

constant acceleration

Question 35

distance kinematic equation using velocity and time (no acceleration)

Answer 35

d = 1/2 (Vi+Vf)*t

Question 36

distance kinematic equation with no final velocity?

Answer 36

d = Vit + 1/2at^2

Question 37

final velocity kinematic equation with no displacement

Answer 37

Vf = Vi + at

Question 38

final velocity equation with time missing?

Answer 38

Vf^2 = Vi^2 + 2a(delta d )

Question 39

assumption in free fall problems

Answer 39

constant acceleration g = -9.8 m/s^2 - no initial velocity!

Question 40

for projectile motion problems when does Vy = 0

Answer 40

when the object reaches its peak

Question 41

what is the definition of force?

Answer 41

an objects mass times its acceleration units : N derived : Kg*m/s^2

Question 42

types of force on the MCAT

Answer 42

1. gravitational (@ a distance) 2. electromagnetic (between charges) 3. contact 4. normal (against gravity) 5. friction 6. tension (rope). 7. centripital 8. spring (using hooke's law)

Question 43

Newton's first law

Answer 43

statement on inertia object at rest will stay at rest unless acted upon, and an object in motion will stay in motion at a constant velocity unless acted upon

Question 44

newton's second law

Answer 44

F= m*a

Question 45

newton's third law

Answer 45

force pairs exert force on eachother equally and opposite F a on B = -F B on A

Question 46

center of mass

Answer 46

X center = (m1X1 + m2X2) / (m1 + m2)

Question 47

friction

Answer 47

force that opposes horizontal motion can be static (Fs) or moving (Fk) equation for static: Fs*N equation for kinetic: Fk*N

Question 48

terminal velocity

Answer 48

highest velocity of an object obtained while traveling through a fluid (can no longer accelerate)

Question 49

how do you calculate the x component of force of gravity on an incline plane?

Answer 49

Fsin(theta)

Question 50

force of gravity equation

Answer 50

Fg = G (M1M2) / r^2

Question 51

centripetal acceleration

Answer 51

a = v^2/ r

Question 52

centripital force

Answer 52

mv^2/r

Question 53

hooke's law

Answer 53

-Kx= Force of spring k is a constant unique to each spring

Question 54

torque definition and equation

Answer 54

torque is rotational force (at a distance) T = F * d sin(theta)

Question 55

what are the ways to increase torque?

Answer 55

increase force increase distance

Question 56

rotational potential

Answer 56

t = f*d t = mg*d

Question 57

work

Answer 57

force over a distance W= f*dcos (theta) unit: J or N*m - conservative force (independent of path)

Question 58

mechanical advantage

Answer 58

on a slope, allows for less force with same work length of slope/ height of slope

Question 59

power

Answer 59

work done over time P= w/t also p = V*f watts