physics

Question 1

instantaneous velocity

Answer 1

the velocity of an object at any given period of time

Question 2

velocity unit

Answer 2

m/s

Question 3

constant velocity

Answer 3

if object moves in a straight line and travles with equal displacements through equal time intervals

Question 4

acceleration

Answer 4

the change of velocity in a given time interval

Question 5

when acceleration = 0?

Answer 5

when the velocity has constant magnitude and direction

Question 6

free fall

Answer 6

Is the fall of object from a certain hight under the effect of earth gravitational force

Question 7

why free fall always have negeative sign

Answer 7

because its directed down

Question 8

force

Answer 8

the effect that changes or try o change the motion state of the object or the object shape (vector)

Question 9

the force has a few effects

Answer 9

push, pull , tensile , clipping , rotation and torsion

Question 10

contact forces

Answer 10

forces effect two object having direct contact

Question 11

gravity force

Answer 11

the reciprocal attraction force between any two masses in the universe

Question 12

electrical force

Answer 12

is the force between two electrical charges like the attraction of paper to comb

Question 13

strong nuclear force

Answer 13

this connect the nucleons with each other

Question 14

weak nuclear force

Answer 14

this is responsible for the decay of beta particles

Question 15

inertia

Answer 15

the property of an object which indicates the a mount of resistance that the object shows for any change in the motion state

Question 16

newtons first law

Answer 16

an object at rest remains at rest or if in motion remains in motion unless acted upon by a nety external force

Question 17

newtons second law

Answer 17

the acceleration is directly proportional to the net resultant force that influence the object with constant mass

Question 18

weight

Answer 18

the amount of force that gravity influence on an object

Question 19

newtons general law

Answer 19

2 particles attract eachother with forces directly proportional to product of masses divided by distance squared

Question 20

mass

Answer 20

amount of matter in an object

Question 21

circular velocity

Answer 21

the motion of object on a circular path with constant magnitude of velocity and variable direction

Question 22

magnetic force

Answer 22

the force between two magnetic poles

Question 23

rectangualr coordinares

Answer 23

contain two axis vertical axis x and horizontal axis y which are perpendicular to each other and intersect at 0,0 (origin point)

Question 24

polar coordinates

Answer 24

are the angles that are determined by distance r and angle theta that is the angle between distance r andf horizontal axis

Question 25

cosine law

Answer 25

the magnitude of resultant vector squared equals the summation of two vectors squared minus the double of vectors magnitude multiplication by cosine r^2=a^2 + b^2 - 2ABcos theta

Question 26

sine law

Answer 26

the magnitude of resultant vector divided by sine of the opposite angle equals magnitude of one of the vectors divided by sine of opposite angle r/siny = a/sina = b/sinb

Question 27

dot product

Answer 27

A.B = |A||B|cosTHETA

Question 28

cross product

Answer 28

AxB =|A||B|sin THETA

Question 29

find x component

Answer 29

rcostheta

Question 30

find y component

Answer 30

rsintheta

Question 31

convert rectangular to polar

Answer 31

r=sqrt>x^+y^2 | tantheta = y/x

Question 32

vector quantities are represented with an arrow which

Answer 32

lenght of arrow is proportional to magnitude using certain scale direction of arrow determines direction of vector origin point represent starting point

Question 33

when does vector have components with equal magnitudes

Answer 33

when angle between 2 vectors is 45

Question 34

if component of vector a towards vector b equal 0 what can we say about ab

Answer 34

the two vectors are perpendicular

Question 35

can vector component be 0? even if magnitude of vector not 0

Answer 35

yes if vector on x,y axis

Question 36

can vector have negative magnitude

Answer 36

no because magnitude of vector in absolute value

Question 37

can vector component be greater than vector magnitude

Answer 37

no because vector and its components form right angle triangle and vector is hypotenuse so its longer

Question 38

kinematics

Answer 38

science | that describes the objects motionn ignoring what caused it

Question 39

dynamics

Answer 39

a science that studies the causes of motion

Question 40

motion has different kinds give example

Answer 40

car movement on street is called transition motion eart rotartion around axis is called rotational motion pednulum motion is called vibratory motion

Question 41

motion

Answer 41

is the continous change in object location with respect to a constant point

Question 42

position

Answer 42

is a vector quantity that has magnitude and direction with respect to origin point

Question 43

average velocity

Answer 43

ratio between change in displacement over change of time

Question 44

average speed

Answer 44

ratio between distance traveled over time interval

Question 45

when does avg speed = avg velocity

Answer 45

when object movement is in straight line

Question 46

system

Answer 46

is the group of objects

Question 47

tensile force

Answer 47

the force that the rope influence the object

Question 48

internal force

Answer 48

result of interaction between components

Question 49

define the external force

Answer 49

force that influences the system