physical science test 2

Question 1

proportion

Answer 1

an equation equivalent to a ratio

Question 2

directly proportional

Answer 2

2 values related, multiplying one number requires that the other be multiplied by the same #

Question 3

inversely proportional

Answer 3

2 values related, multiplying one # requires that the other # be divided

Question 4

resultant

Answer 4

2 or more vectors

Question 5

colenear

Answer 5

vectors same direction or opposite directions

Question 6

second law of motion

Answer 6

F=MA

Question 7

third law

Answer 7

for every action there is a reaction

Question 8

free body diagram

Answer 8

represents objects and forces

Question 9

net force

Answer 9

indivail forces on an object through vector addition

Question 10

gravity

Answer 10

force on an object near the surface of the earth

Question 11

weight

Answer 11

the amount of gravity

Question 12

law of university gravitation

Answer 12

2 objects attract each other through gravitational force

Question 13

G

Answer 13

G=9.81 m/s2

Question 14

terminal velosity

Answer 14

an object will speed up

Question 15

centripetal force

Answer 15

curved path rather than straight line

Question 16

dynamics

Answer 16

the study of motion of forces and motion

Question 17

motion

Answer 17

state of change in position

Question 18

acceleration

Answer 18

any change in velocity

Question 19

deceleration

Answer 19

opposite direction in motion

Question 20

wheel and axle

Answer 20

a simple machine that is similar to circular lever

Question 21

screw

Answer 21

resembling an incline plain wrapping around a rod

Question 22

pitch

Answer 22

a distance from one of the ridges or threads to the next

Question 23

wedges

Answer 23

special form of an incline plan

Question 24

lever

Answer 24

a simple machine consisting of a ridged bar or beam resisting a pool and rivit

Question 25

incline plane

Answer 25

sloping surface that allows an object to be raised without lifting it straight up

Question 26

pulley

Answer 26

simple machine that has a wheel and a rope or cable can pass

Question 27

fixed pulley

Answer 27

reverses the input force without multiplying it

Question 28

block and tackle

Answer 28

1 or more fixed pulleys

Question 29

movable pulley

Answer 29

input force applies only half of output force

Question 30

input

Answer 30

any force applied to a machine

Question 31

output

Answer 31

force that machine applies after multiplication

Question 32

class 1 lever

Answer 32

(scissors) input and output opposite sides and fulcrum in middle

Question 33

class 2 lever

Answer 33

(wheelbarrow) fulcrum and input on opposite sides and output in middle

Question 34

class 3 lever

Answer 34

(weights or fly swatter) fulcrum and output on opposite sides and input in the middle

Question 35

fulcrum

Answer 35

the pivot upon which the beam of a lever rests

Question 36

efficiency

Answer 36

the ratio of work output to work input in a machine

Question 37

MA

Answer 37

the number of times a machine multiplies the input

Question 38

AMA

Answer 38

the actual multiplication of force a machine

Question 39

IMA

Answer 39

the multiplication of force provided by a machine under ideal conditions

Question 40

machine

Answer 40

any device that can do work

Question 41

simple machine

Answer 41

any of the 6 basic force multiplying machines

Question 42

momentum

Answer 42

the quantity of motion

Question 43

law of conservation of momentum

Answer 43

the law station the overall momentum of a system remains constant an external force is applied to it

Question 44

power

Answer 44

the rate of doing work or using energy work done or energy used per unit of time

Question 45

watt

Answer 45

unit of power, one joule of work done in one second

Question 46

work

Answer 46

the transfer of energy from one object to another force

Question 47

friction

Answer 47

the resistance arising to a objects motion through liquid or across a surface

Question 48

joule

Answer 48

SI unit of work and energy equal to the work done in moving an object a distance of 1 M by pushing it with a force of 1M

Question 49

centrifugal force

Answer 49

straight line

Question 50

velocity formula

Answer 50

V=^X/T

Question 51

Acceleration formula

Answer 51

A=VF-VI/T

Question 52

Newton formula

Answer 52

N=kg. M/s2

Question 53

second law formula

Answer 53

F=MA