Kinematic and Dynamics

Question 1

angstrom

Answer 1

10E-10 m

Question 2

electron-volts

Answer 2

1.6E-19 J

Question 3

vectors have ___ & ____

Answer 3

magnitude & direction

Question 4

scalars have ____

Answer 4

only magnitude

Question 5

resultant vector

Answer 5

the sum of two or more vectors

Question 6

tip-to-tail method

Answer 6

way of determining resultant vector through a graph

Question 7

Pythagorean Theorem

Answer 7

X^2+Y^2=V^2

Question 8

vector subtraction

Answer 8

A-B=A+(-B)

Question 9

vector multiplication

Answer 9

B=nA, where B is new v and A is old. Direction is determined by sign of n

Question 10

dot product: generate scalar quantity from vectors

Answer 10

AB = absAabsBcosθ

Question 11

cross product: generate vector such as torque

Answer 11

AB=absAabsB*sinθ

Question 12

displacement (x or d)

Answer 12

change in position in space

Question 13

distance (d)

Answer 13

scalar quantity

Question 14

velocity (v)

Answer 14

rate of change of displacement

Question 15

speed

Answer 15

rate of actual distance traveled

Question 16

instantaneous velocity

Answer 16

v=lim(t app 0) Δx/ Δt

Question 17

average velocity

Answer 17

v=Δx/ Δt

Question 18

Force

Answer 18

a vector quantity experienced as pushing or pulling on an object

Question 19

newton (N)

Answer 19

kg*m/s^2

Question 20

Gravity

Answer 20

attractive force felt by all matter

Question 21

gravitational force

Answer 21

GmM/r^2

Question 22

friction

Answer 22

opposes the movement of objects

Question 23

static friction (Fs)

Answer 23

0

Question 24

normal force (N)

Answer 24

component of force between two objects in contact that is perpendicular to the plane of contact between the object and the surface upon which it rests

Question 25

kinetic friction

Answer 25

Fk=UkN (Fk=kinetic friction, Uk=coefficient of kinetic friction and N=normal force)

Question 26

Mass (m)

Answer 26

amount of matter in an objectq

Question 27

Weight

Answer 27

mass*gravity

Question 28

center of mass

Answer 28

defined as three coordinates:x,y,z

Question 29

average acceleration

Answer 29

Δv/Δt

Question 30

instantaneous acceleration

Answer 30

lim(t->0)Δv/Δt

Question 31

Newton's First Law, inertia

Answer 31

Fnet=ma=0; a body at rest or in motion w constant velocity will remain that way unless acted upon by a net force

Question 32

Newton's Second Law

Answer 32

Fnet=ma; An object of mass m will accelerate when the vector sum of the forces results in some nonzero resultant force vector

Question 33

Newton's Third Law

Answer 33

Fab= -Fba; to every action, there is an equal and opposite reaction

Question 34

Linear motion equations

Answer 34

Vf=Vi+at x=Vit+.5at^2 Vf^2=Vi^2+2ax x=vt

Question 35

free fall

Answer 35

acceleration is equal to gravity

Question 36

air resistance

Answer 36

opposes the motion of an object

Question 37

drag force

Answer 37

objects in free fall experience this

Question 38

terminal velocity

Answer 38

begins when drag force is equal in magnitude to weight of the object

Question 39

projectile motion

Answer 39

motion that follows path along two dimensions

Question 40

Vx and Vy in projectile motion

Answer 40

Vx changes at rate of g, Vx remains constant

Question 41

Inclined planes

Answer 41

motion in two dimensions, parallel and perpendicular to plane

Question 42

Components of inclined planes

Answer 42

Fgparallel= mgsinθ | Fgperpendicular=mgcosθ

Question 43

uniform circular motion

Answer 43

instantaneous velocity vector is always tangent to circular path

Question 44

centripetal force

Answer 44

points radially inward

Question 45

centripetal acceleration

Answer 45

centripetal force generates this acceleration

Question 46

Centripetal force equation

Answer 46

Fcent=mv^2/r

Question 47

dynamics

Answer 47

study of force and torques

Question 48

free body diagrams

Answer 48

diagram representation of forces

Question 49

translational equilibrium

Answer 49

exists when vector sum of all forces is zero

Question 50

rotational equilibrium

Answer 50

forces are applied against an object such that it rotates around a fixed pivot point

Question 51

fulcrum

Answer 51

fixed pivot point

Question 52

torque

Answer 52

generated by application of force some distance from the fulcrum

Question 53

lever arm

Answer 53

distance between applied force and fulcrum

Question 54

equation for torque

Answer 54

r*F=rFsinθ

Question 55

rotational equilibrium

Answer 55

when vector sums of all torque acting on an object is zero