Chapter 4

Question 1

acts perpendicular to the surface on which the object rest

Answer 1

normal force

Question 2

all forces acting on inertial frame of reference are real forces, as opposed to fictitious forces that are observed due to an accelerating frame of reference

Answer 2

inertial frame of reference

Question 3

all forces originating from outside of the system are considered external force

Answer 3

system

Question 4

body remains at rest or if in motion remains in motion at a constant velocity unless acted on by a net external force

Answer 4

Newton’s first law of motion

Question 5

can be expressed as a multiple of standard force

Answer 5

force

Question 6

can be represented by vectors

Answer 6

force

Question 7

causes a mass to accelerate

Answer 7

net external force

Question 8

coordinate system that is not accelerating

Answer 8

inertial frame of reference

Question 9

defined by boundaries of an object or collection of object’s being observed

Answer 9

system

Question 10

defined mathematically as a=F/m

Answer 10

Newton’s second law of motion

Question 11

defined mathematically as w=mg, where g is the magnitude and direction of the acceleration due to gravity

Answer 11

weight

Question 12

Fnet on an object with mass is proportional to and in the same direction as the acceleration of the object, a, inversely proportional to the mass

Answer 12

Newton’s second law of motion

Question 13

force acting on object originates outside of the object

Answer 13

external force

Question 14

force past each objects that are touching: ex. include rough surfaces and air resistance

Answer 14

friction

Question 15

force that surface applies to an object to support the weight of an object

Answer 15

normal force

Question 16

force w due to gravity acting on an object of mass

Answer 16

weight

Question 17

fundamental particle of nature by characteristic force field

Answer 17

carrier particle

Question 18

Known as law of inertia

Answer 18

Newton’s first law of motion

Question 19

measured in kilogram

Answer 19

mass

Question 20

Newton’s first law of motion

Answer 20

Law of inertia

Question 21

photons are ______ of electromagnetic force

Answer 21

carrier particle

Question 22

pulling force that acts along a medium, esp. stretched flexible connector such as cable or rope

Answer 22

tension

Question 23

push or pull on object with specific magnitude and direction

Answer 23

force

Question 24

Quantity of matter in substance

Answer 24

mass

Question 25

rate of object’s velocity change over time

Answer 25

acceleration

Question 26

reaction force that pushes a body forward in response to a backward force; rockets, airplanes, and cars are pushed forward by a thrust reaction force

Answer 26

thrust

Question 27

region which test particle will experience a force

Answer 27

force field

Question 28

represented by dots, forces are represented by vectors extending outward from the dot

Answer 28

free-body diagram

Question 29

study of how forces affect motion of object’s and systems

Answer 29

dynamics

Question 30

tendency of object to remain at rest or remain in motion

Answer 30

inertia

Question 31

vector sum of external forces acting on object

Answer 31

net external force

Question 32

when a rope supports the weight of an object, the force on the object due to the rope is called a tension force

Answer 32

tension

Question 33

whenever one body exerts a force on a second body, first body experiences a force that is equal in magnitude and opposite in direction to the force that the first body exerts

Answer 33

Newton’s third law of motion

Question 34

situation which only force acting on an object is force due to gravity

Answer 34

free-fall

Question 35

sketch showing all external forces acting on object

Answer 35

free-body diagram