Chapter 11

Question 1

Force

Answer 1

push or pull applied by one object and experienced by another

Question 2

Net force

Answer 2

= all forces acting on object

Question 3

What adds together for net force?

Answer 3

forces in the same direction

Question 4

What subtracts from the net force

Answer 4

forces in the acting in the opposite direction

Question 5

Weight

Answer 5

force of planet on an object near that planet

Question 6

force of friction

Answer 6

force of a surface on an object

Question 7

friction force acts _ to surface

Answer 7

parallel

Question 8

kinetic friction

Answer 8

force of friction when something is moving along the surface

Question 9

kinetic force acts

Answer 9

opposite the direction of motion

Question 10

static friction

Answer 10

friction force between two surfaces that aren’t moving relative to one another

Question 11

normal force

Answer 11

force of a surface on an object

Question 12

normal force acts _ to the surface

Answer 12

perpendicular

Question 13

coefficient of friciton

Answer 13

number that tells how sticky two surfaces are

Question 14

Newton’s 3rd law

Answer 14

force of Object A on Object B is equal in amount and opposite in direction to the force of Object B on Object A

Question 15

Newton’s 2nd law

Answer 15

object’s acceleration = (net force it experiences/mass) and is in the direction of net force

Question 16

how is a force often measured in a laboratory

Answer 16

spring scale

Question 17

Two aspects of force

Answer 17

1. what objects were involved, how much force, which direction of force
2. calculate net force acting on object to object’s change in velocity

Question 18

an object can _ a force, not _ a force

Answer 18

experience/have

Question 19

canonical

Answer 19

conforming to general rule

Question 20

free body diagram has

Answer 20

1. labeled arrow representing each force, with each arrow beginning on the object and pointing in the direction in which the force acts
2. List of all the forces acting on the object, indicating the object applying the force and the object experiencing the force

Question 21

Which forces can act on an object without contact?

Answer 21

gravitational and electrical

Question 22

instead of the term gravity, use _

Answer 22

weight: force of Earth on car

Question 23

all free-body diagram starts with

Answer 23

gravity

Question 24

weight acts

Answer 24

downward

Question 25

any other forces must be a result of

Answer 25

contact

Question 26

all forces must be exerted by an

Answer 26

identifiable object

Question 27

how to determine net force with acceleration in a direction

Answer 27

net force = mass * acceleration

Question 28

when an object moves along a surface, the acceleration in a direction perpendicular to that surface must be

Answer 28

net force perpendicular to the surface is 0

Question 29

kinetic friction force =

Answer 29

coefficient of kinetic friction times the normal force

Question 30

coefficient of friction

Answer 30

property of the surfaces in contact (less sticky, coefficient of friction decreases = less friction = smaller force of friction)

Question 31

coefficient of friction takes 2 forms

Answer 31

static and kinetic

Question 32

coefficient of static friction is used for something that is

Answer 32

stationary

Question 33

coefficient of kinetic friction if the object is

Answer 33

moving

Question 34

coefficient of static friction is a _ value

Answer 34

maximum

Question 35

maximum coefficient of static friction =

Answer 35

1. find how much horizontal pushing force will just barely make the book move 2. use formula

Question 36

how to find 3rd law companion force

Answer 36

1. look at description of force in free-body diagram and reverse objects applying and experiencing the force

Question 37

If net force has both vertical and horizontal component, use _ to determine the magnitude of the net force

Answer 37

pythagorean theorm

Question 38

If net force has both vertical and horizontal component, use

Answer 38

tangent to determine the direction of net force

Question 39

Newton's third law companion forces/ Newton's third law force pair

Answer 39

force of object A on object B is equal in amount and opposite in direction to the force of object B on Object A. Those two forces are the pair

Question 40

when a force acts at an angle measured from the horizontal, the vertical component of that force is =

Answer 40

amount of the force itself * sine of angle

Question 41

when force acts at an angle measured from the horizontal, the horizontal component of that force =

Answer 41

amount of force itself * cosine of angle