Test Two Linear motion

Question 1

what is linear kinematics

Answer 1

the study of description of the spatial and temporal characteristics of motion without regard to causative forces

Question 2

what is linear motion

Answer 2

motion along an axis in which all points of the system move at the same time, same direction and same distance

Question 3

linear motion can have what type of direction

Answer 3

rectilinear and curvilinear

Question 4

what is linear distance traveled

Answer 4

the total length of the path traveled by the system of interest

Question 5

what is linear displacement

Answer 5

the change in linear position of the system in a straight line

Question 6

linear displacement is represented as

Answer 6

delat p or d

Question 7

why is linear distance only scalar

Answer 7

it only indicates magnitude

Question 8

what is speed

Answer 8

scalar rate of motion

Question 9

speed is represented as

Answer 9

s

Question 10

what are the units of velocity

Answer 10

m/s

Question 11

what is peak rate of motion

Answer 11

maximum rate of motion achieved

Question 12

is it possible that the system will not have the same rate of motion throughout the position change

Answer 12

yes, periods of speeding up and slowing down

Question 13

what is acceleration

Answer 13

change in magnitude and/or direction of the velocity with respect to time

Question 14

what is the units for acceleration

Answer 14

m/s^2

Question 15

describe velocity when acceleration is zero

Answer 15

Vf=Vi

Question 16

describe velocity when acceleration is positive

Answer 16

Vf > Vi

Question 17

describe velocity when acceleration is negative

Answer 17

Vf

Question 18

acceleration is negative is also known as

Answer 18

deacceleration

Question 19

how can acceleration be negative

Answer 19

force and acceleration in opposite direction of object moving

Question 20

what is average acceleration

Answer 20

rate of change in velocity divided by the entire interval over which it changed

Question 21

what is instantaneous acceleration

Answer 21

rate of change in velocity at one specific instant in time

Question 22

instantaneous acceleration also known as

Answer 22

peak acceleration

Question 23

what is newton’s first law, law of inertia

Answer 23

every body remains in its state of rest, or of uniform motion in a right line, unless it is compelled to change that state by forces impressed thereon

Question 24

if there is no linear displacement, velocity is equal to

Answer 24

zero

Question 25

if the object is already in motion and traveling with a given velocity, there is

Answer 25

no change in that linear velocity without an externally applied force

Question 26

if linear velocity does not change, then the system

Answer 26

does not accelerate

Question 27

what is Newton's second law, law of acceleration

Answer 27

the alteration of motion is eve proportional to the motive force impressed, and is made in the direction of the right line in which that force is impressed

Question 28

the acceleration of the system is inversely proportional to

Answer 28

the mass of the system to which the given force is applied

Question 29

so if you have a small mass, what happens to acceleration

Answer 29

increase

Question 30

what is Newton's third law, law of reciprocal actions

Answer 30

to every action there is always opposed an equal reaction, or the mutual actions of the two bodies upon each other are always equal, and directed to contrary parts

Question 31

do forces exist in pairs

Answer 31

yes

Question 32

how can you have unequal reactions of equal and opposite forces

Answer 32

because of variations in mass

Question 33

what is momentum

Answer 33

a system's quantity of motion

Question 34

the greater the quantity of motion possessed by a system, the more difficult

Answer 34

it is to stop that motion

Question 35

momentum can be gained by

Answer 35

increasing mass, increasing velocity

Question 36

how to calculate momentum

Answer 36

mass x velocity

Question 37

principle of conservation of linear momentum

Answer 37

in the absence of a net externally applied force, the total momentum of a system that comprises multiple bodies remains constant in time

Question 38

when would you use the principle of conservation of linear momentum

Answer 38

predicting the outcome of collisions

Question 39

with collision, how would that affect the principle of conservation of linear momentum

Answer 39

the total momentum of the system just BEFORE the collision equals the total momentum just AFTER collision, system is made up of two or more bodies

Question 40

what are the two general categories of collisions

Answer 40

elastic and inelastic

Question 41

what is an elastic collision

Answer 41

when two objects collide and bounce off each other

Question 42

what is an inelastic collision

Answer 42

the objects collide and stick together

Question 43

what happens to the velocity of inelastic collision

Answer 43

stuck objects will be traveling at the same velocity

Question 44

what happens to momentum and velocity of inelastic collision

Answer 44

total momentum conserved, and the velocities will change but the velocities of the objects after collision will be equal

Question 45

can collisions be categorized as elastic or inelastic

Answer 45

no

Question 46

actual result of a collision in terms of velocity change and momentum conservation depends upon

Answer 46

degree to which the objects stick together during collision, the elasticity of the objects, friction, air resistance, gravity

Question 47

what is linear impulse

Answer 47

the product of applied force and the interval of force application

Question 48

what are some characteristics of linear impluse

Answer 48

must be an applied force to accelerate a body, force must be applied for a certain time, more massive the body the more force need to be applied to accelerate it, acceleration is a change in velocity, mass and velocity represent momentum.

Question 49

if mass is constant and the velocity of the mass changes, then

Answer 49

the mass is accelerated

Question 50

what is work

Answer 50

performed when an object is displaced by the application of a force

Question 51

what is energy

Answer 51

the capacity to perform that work

Question 52

characteristics of work

Answer 52

can be positive or negative, no matter how much physical effort was involved on the part of the person, no mechanical work was performed if the object was not displaced

Question 53

what is power

Answer 53

used to express the amount of mechanical work performed in a given interval

Question 54

when is power greater

Answer 54

if same amount of work is performed in a shorter time

Question 55

what is potential energy

Answer 55

the capacity of an object to perform work because of its position, deformation, or configuration. Potential for conversion to kinetic energy

Question 56

an object possessing potential energy has the capacity to perform work but is not yet

Answer 56

in motion

Question 57

what are the two types of PE

Answer 57

gravitational and elastic

Question 58

what is gravitational PE

Answer 58

PE that an object has because of its position relative to a reference surface

Question 59

what is elastic PE

Answer 59

PE stored in a deformed object

Question 60

what is kinetic energy

Answer 60

objects in motion have the potential to perform work, energy associated with motion

Question 61

what is the law of conservation of mechanical energy

Answer 61

in the absence of externally applied forces other than gravity, the total mechanical energy of a system remains constant

Question 62

energy transfer from one system to another takes place in the form of

Answer 62

work

Question 63

what is the principle of work and energy

Answer 63

the work performed by externally applied forces other than gravity causes a change in energy of the object acted upon