Force and Motion

Question 1

Velocity vs Time graph area

Answer 1

displacement

Question 2

position vs time graph slope

Answer 2

velocity

Question 3

velocity vs time graph slope

Answer 3

acceleration

Question 4

acceleration vs time graph area

Answer 4

velocity

Question 5

static friction

Answer 5

frictional force that prevents 2 surfaces from sliding
the upper limit is static coefficient x normal force
increasing stretch will increase friction

equal to the magnitude of the applied force

Question 6

coefficient of static friction

Answer 6

based on properties of the surfaces involved

Question 7

kinetic friction

Answer 7

friction when two surfaces slide against one another

friction drops once moving and then remains constant

Question 8

kinetic vs static friction

Answer 8

kinetic friction has a lower coefficient than static

so kinetic friction will always ben lower than static friction

Question 9

nonconservative force

Answer 9

energy is not conserved in the system and will dissipate in other forms of energy like heat and sound

ex: friction

Question 10

nonconservative vs conservative force in work equation

Answer 10

nonconservative force will use total distance because the energy is not contained within the system
work down and back is W=F(2L)

conservative force will use displacement because energy is contained
therefore the work when down and back is 0

Question 11

acceleration

Answer 11

change in velocity/change in time

Question 12

vacuum

Answer 12

lacks particles so no sound

or anything that needs to be carried through matter

Question 13

attenuation

Answer 13

dampening
decreasing amplitude, increases with distance
occurs mostly in soft materials

Question 14

sound

Answer 14

propagates through vibrations of molecules as longitudinal pressure waves
compression is on peaks
rarefaction is on troughs

fastest in solids
does not occur in vacuums

Question 15

vectors

Answer 15

magnitude and direction

displacement, velocity, acceleration, force

Question 16

scalars

Answer 16

quantity without direction

speed, coefficient of frition

Question 17

dot product

Answer 17

ABcos(theta)

Question 18

cross product

Answer 18

ABsin(theta)

Question 19

displacement

Answer 19

change in position; path independent

Question 20

distance

Answer 20

path traveled

Question 21

velocity

Answer 21

Δx/t

Question 22

force

Answer 22

push or pull that creates acceleration

F=ma

Question 23

Friction

Answer 23

opposes motion

Question 24

acceleration

Answer 24

Δv/Δt

velocity vs time graph slope

Question 25

Newton’s First Law

Answer 25

an object in motion stays in motion, an object at rest stays at rest if no net force

inertia

Question 26

Newton’s second law

Answer 26

F= ma

Question 27

Newton’s third Law

Answer 27

every force has an equal and opposite force

Question 28

Kinematics (no displacement)

Answer 28

V=V(0) + at

Question 29

Kinematics (no final velocity)

Answer 29

X = V(0)t + (at^2)/2

Question 30

Kinematics (no time)

Answer 30

V^2 = V(0)^2 + 2ax

Question 31

Kinematics (no acceleration)

Answer 31

x = vt

Question 32

torque

Answer 32

T = rFsin(theta)

clockwise = negative
counterclockwise = positive

Question 33

Gravitational equation

Answer 33

Gmm/r^2

remember that Force is indirectly proportional to r^2
and directly proportional to mass

Question 34

Centripetal force

Answer 34

F = mv^2/r

Question 35

surface tension

Answer 35

cohesive forces that resist changes to movement

surface tension decreases with heat and increased surface area (stretches molecules)

Ts = F/d (force/distance)

Question 36

electric forces

Answer 36

generated by voltage source and by intrinsic electrical properties of material

unaffected by temperature

Question 37

center of mass

Answer 37

the system of point masses where the mass x radius is added for every point and then divided by the total mass to find where the equal/balance point is

This changes as someone grows taller

Question 38

mechanical advantage

Answer 38

ratio of output force Fo to input force Fi

Fo/Fi = Di/Do

can use this when trying to lift heavier things - input 20N of force to be able to move something that is 400N (math doesn’t work out)