chapter 6 lesson 5

Question 1

free fall

Answer 1

when the only force acting on an object is gravity

Question 2

what causes an object to accelerate

Answer 2

force of gravity

Question 3

free fall is motion where acceleration…

Answer 3

is caused by gravity

Question 4

what is in the air

Answer 4

fluid friction

Question 5

friction acts against gravity reducing..

Answer 5

reducing acceleration to falling objects

Question 6

when does air friction increase

Answer 6

as an object falls

Question 7

it will fall at a

Answer 7

constant velocity

Question 8

what does air friction reduce

Answer 8

accelerated

Question 9

what motions act independently

Answer 9

horizontal and vertical

Question 10

satellites

Answer 10

objects that orbit around other objects in space following a curved path around earth

Question 11

why do satellites travel around earth instead of falling into it

Answer 11

because earth is curved

Question 12

what causes a satellite to move ahead

Answer 12

inertia

Question 13

what continuously changes a satellites direction

Answer 13

gravity

Question 14

why is an object traveling in a circle accelerate

Answer 14

because of constant change in direction

Question 15

centripetal force

Answer 15

force that causes an object to move in a circular path

Question 16

where do centripetal forces always point to

Answer 16

the center of earth

Question 17

acceleration

Answer 17

rate at which velocity changes

Question 18

what does velocity mean

Answer 18

change in speed and direction

Question 19

what does acceleration refer to

Answer 19

increasing speed, decreasing speed, or changing direction

Question 20

what is another name for change in speed

Answer 20

deceleration or negtaive acceleration

Question 21

you can change direction with out changing…

Answer 21

speed

Question 22

what does force mean

Answer 22

push or pull

Question 23

force is described by its strength and…

Answer 23

in which direction it acts

Question 24

what is measured by the SI unit

Answer 24

newtons

Question 25

what is net force

Answer 25

the combination of all the forces on an object

Question 26

what does net force determine

Answer 26

if and how an object will accelerate

Question 27

what does a nonzero net force cause

Answer 27

a change in objects motion

Question 28

friction

Answer 28

the force that two objects exert on each other when they rub against each other

Question 29

what are two factors that affect the force of friction

Answer 29

types of surfaces involved and how hard they're pushed against each other

Question 30

what direction does friction act in

Answer 30

opposite

Question 31

static friction

Answer 31

acts between objects that aren't moving

Question 32

sliding friction

Answer 32

when two solid surfaces slide over each other

Question 33

fluid friction

Answer 33

when an object moves through fluid

Question 34

rolling friction

Answer 34

when an object rolls across a surface

Question 35

gravity

Answer 35

a force that pulls objects towards each other

Question 36

law of universal gravitation

Answer 36

The force of gravity acts between all objects in the universe that have mass

Question 37

where does gravitational force exist?

Answer 37

Between any two objects in the universe

Question 38

what are two factors that affect the gravitational attraction between objects

Answer 38

Mass and distance

Question 39

mass

Answer 39

Measure of the amount of matter in an object

Question 40

What causes a greater gravitational force?

Answer 40

More mass

Question 41

what does gravitational force depend on?

Answer 41

Distance between objects centers 

Question 42

when distance increases

Answer 42

Gravitational force decreases

Question 43

weight

Answer 43

A measure of the force of gravity on an object

Question 44

A moving object will continue at a constant velocity until

Answer 44

A force acts to change its speed and direction

Question 45

Newtons first law of motion

Answer 45

An object at rest will remain at rest, unless acted upon a nonzero net force. An object moving at a constant velocity, will continue moving at a constant velocity, unless acted upon by a nonzero net force.

Question 46

inertia

Answer 46

All objects resist change of motion

Question 47

Newton second law of motion

Answer 47

An objects acceleration depends on its mass, and on the net force acting on it

Question 48

Newton second law of motion shows that force is measured

Answer 48

Kilograms times meters per second to meters per second

Question 49

newtons third law of motion

Answer 49

If one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction of the the first object

Question 50

What forces are all around you?

Answer 50

Action and reaction forces

Question 51

momentum

Answer 51

A characteristic of a moving object that is related to the mass and the velocity of the object

Question 52

momentum of a moving object can be determined by

Answer 52

Multiplying the objects mass by its velocity

Question 53

how is momentum measured

Answer 53

Kilograms times meters per second

Question 54

What is momentum described by

Answer 54

Direction and strength

Question 55

A quantity that was conserved is

Answer 55

The same before and after

Question 56

law of conservation of momentum

Answer 56

In the absence of outside forces like friction, the total momentum of an object that interact doesn’t change