Physics Unit Final

Question 1

what do you do if a question comes in scientific notation

Answer 1

answer in scientific notation

Question 2

what two types of graphs can be used for uniform motion

Answer 2

distance-time graph and speed-time graph

Question 3

what is the line of best fit on a distance time graph showing unirfomr motion

Answer 3

a stright line with a positive slope

Question 4

what does the slope of a distance-time graph fepresent

Answer 4

the speed of an object

Question 5

what does the line of best fit in a speed-time graph depicting uniform motion look like

Answer 5

a horizontal straight line

Question 6

what does the line of best fit on a speed-time graph indicate when the object is travelling in uniform motion

Answer 6

that as time increasees the speed of the object remains constant

Question 7

what does a slope of 0 meanm in a distance time graph

Answer 7

there is no motion

Question 8

how do you determine the distance travelled by the object in a speed-time graph

Answer 8

calculate the area under the line of the graph

Question 9

what two types of graphs can be used to analyze average velocity

Answer 9

position-time graph, velocity-time graph

Question 10

when do you not need to indicate direction when solving for a vector quantity

Answer 10

if you are just aksed for a magnitude

Question 11

what is the simplest type of motion

Answer 11

uniform motion

Question 12

what is the most common type of motion

Answer 12

acceleration

Question 13

what is the line of best fit look like in a position-time graph showing acceleration

Answer 13

a smooth curve

Question 14

what is the typical pattern of motion for an object

Answer 14

an ‘s’ like curve

Question 15

what does the slope of a velocity-time graph indicate

Answer 15

rate of acceleration

Question 16

what does the line of best fit look like in a velocity-time graph for an object in accelerated motion

Answer 16

a straight line with an increasing or decreasing slope

Question 17

what happens if all the forces on an object are balanced

Answer 17

the object doesn’t move

Question 18

what does everything at rest have acting on it

Answer 18

balanced forces

Question 19

what is force

Answer 19

a push or pull on an object

Question 20

when will an object move

Answer 20

when an unbalanced force is applied to it over a given distance

Question 21

what happens to an object in uniform motion if forces are applied

Answer 21

it will go through acceleration and either increase or decrease in velocity

Question 22

when do all objects tend to remain in uniform motion or stay at rest

Answer 22

in the absence of any external unbalance forces

Question 23

what happens if there is no force acting on an already moving object

Answer 23

it will keep moving

Question 24

what happens when something does work on an object

Answer 24

energy is transferred to that object

Question 25

what are the three conditions for work to occur

Answer 25

there must be movement, there must be application of force, the force and distance the object travels must be in the same direction

Question 26

are energy and work the same thing

Answer 26

yes

Question 27

what happens when a body does work on an object

Answer 27

the body doing the work loses energy and the object that has work done to it gains energy

Question 28

whats chemical energy

Answer 28

potential energy stored in the chemical bonds of compounds that is released when bonds are broken

Question 29

what is occurring during an energy transfer between objects

Answer 29

one object is doing work on the other object

Question 30

what is electircal energry

Answer 30

work done by moving charges in the form of flowing electrons in currents

Question 31

what is nuclear energy

Answer 31

potential energy stored in the nucleas of an atom that is released when the atom is split or when two nuclei of atoms combine

Question 32

what is solar energy

Answer 32

energy that results from a ydorgen-hydrogen nulcear fusion reaction with the release of nuclear energy that can be converted into other energy forms

Question 33

whats nuclear fission

Answer 33

the splitting of the nucleous of an atom

Question 34

what is nuclear fusion

Answer 34

when the nuclei of two atoms combine

Question 35

what two types of energy can be observed in nature

Answer 35

kinetic energy and gravitational potential energy

Question 36

what is earths acceleration due to gravity

Answer 36

9.81 m/s2

Question 37

if you are given two heights in a word problem, which one should you use

Answer 37

the vertical one, or the one that is straight up

Question 38

when plotting a speed-time or velocity-time graph how should you connect the dots

Answer 38

using a line of best fit

Question 39

what happens to an object if it's falling

Answer 39

all of its potential energy from the top will be converted to kinetic energy

Question 40

what can you use the pendulum theory for

Answer 40

to find the speed of an object at the bottom of its course right before it hits the ground

Question 41

what word often indicates the input of energy

Answer 41

consumes

Question 42

what word often indicates the output of energy

Answer 42

work

Question 43

when is potential energy useful

Answer 43

when it is converted into some other form of energy

Question 44

what is the law of conservation of energy state

Answer 44

energy cannot be created or destroeyed. it can only be transformed from one form to another, and the total amount of energy never changes

Question 45

what has to happen in order for the law of conservation of energy to work

Answer 45

the energy lost by one system has to be gained by the other

Question 46

how does a pendulum work

Answer 46

at the top it has full gravitational potential energy and as it swings down in an arc that energy begins to convert to kinetic energy till the pendulum gets to the bottom of the arc at its maximum speed and is converted fully into all kinetic energy

Question 47

what do you need to look for when solving a pendulum problem

Answer 47

a vertical height

Question 48

what are the three things that show that an energy conversion has occurred

Answer 48

change in shape, change in temperature, motion

Question 49

whats a system

Answer 49

the object or objects involved in the energy transfers

Question 50

whats an open system

Answer 50

system that exchanges both matter and energy with its surroundings

Question 51

whats a close system

Answer 51

one that cannot exchange matter but can exchange energy with its surroundings

Question 52

whats an isolated system

Answer 52

one that cannot exchange either matter or energy within its surroundings

Question 53

what is the difference between heat and work

Answer 53

work involves the movement of matter from one location to another whereas heat is a transfer of thermal energy from one location to another

Question 54

what are the two ways the energy of a system can be increased

Answer 54

heat can be added or work can be done on the system

Question 55

what is the first law of thermodynamics

Answer 55

the total energy, including heat, in a system and its surroundings, remains constant. whenever heat is added to a system, it transforms into an equal amount of some other form of energy.

Question 56

what would happen if no energy is converted to other forms

Answer 56

the machine would operate indefinitely

Question 57

is it possible to create a perfect machine

Answer 57

no

Question 58

what is the second law of thermodynamics

Answer 58

heat always flows naturally from a hot object to a cold object, but never natural flows from a cold object to a hot object

Question 59

whats energy input

Answer 59

the initail energy source

Question 60

whats useful energy output

Answer 60

the desired energy needed to do the work

Question 61

whats useful work output

Answer 61

the work the machine is supposed to do

Question 62

whats a solar energy source

Answer 62

those that are derived either directly or indirectly from the energy of the sun

Question 63

whats a non-solar energy source

Answer 63

sources that have no relationship to the sun

Question 64

what are renewable energy sources

Answer 64

ones that are continually and infinitely available or can be replaced in a reasonable length of time

Question 65

whats a non-renewable energy source

Answer 65

sources that are limited and irreplaceable

Question 66

what does a position-time graph measure

Answer 66

displacement

Question 67

what does a velocity-time graph measure

Answer 67

distance

Question 68

what does it mean if there is no displacement

Answer 68

no motion

Question 69

what does a negative velocity mean

Answer 69

you are going that speed in. different direction