PHYS1114 Lab Final

T=2π(√l÷g)

pendulum lab period equation

speeding up

for velocity vs time graph if the graph is moving away from the t-axis, the magnitude of the velocity is...

slowing down

for velocity vs time graph if the graph is moving toward the t-axis, the magnitude of the velocity is...

magnitude of the acceleration

for velocity vs time graph the magnitude of the slope will give you the...

direction of acceleration

for velocity vs time graph the sign of the slope will give you the...

static/kinetic/static

friction lab ________ friction is greater than ________ friction, so _______ friction takes more force to start motion

cork

friction lab ________ has the highest coefficient of static friction, so it has a rougher surface than the others

µk=fk/FN=fk/mg

friction lab coefficient of kinetic friction equation

µs=fs/FN=fs/mg

friction lab coefficient of static friction equation

no, mass and gravity affect friction

friction lab does the surface area affect the coefficient of friction?

the acceleration due to gravity

given the equation: a=(m(sub)a/M1+M2+m(sub)a+m(sub)f)*g the slope of the graph of acceleration vs. the mass ratio is...

straight line through the origin

given the equation: a=(m(sub)a/M1+M2+m(sub)a+m(sub)f)*g describe the graph that you would obtain if you plotted acceleration vs. the mass ratio

greater than

the coefficient of static friction is always ___________ the coefficient of kinetic friction

static

the frictional force that holds an object in place is called __________ friction

kinetic

the frictional force that slows down an object while in motion is called ____________ friction

greater than

the translational kinetic energy of the mass, m, and the rotational kinetic energy of the platter at time, t1, is __________ the translational kinetic energy of the mass, m, and the rotational kinetic energy of the platter at t3 use graph on phone

increase

use pendulum pic on phone a specific pendulum has a period, T, given by the equation T=(2π/√g)*L^½ If the length of the string, L, is increased, the period will...

%diff=(|experimental-experimental|÷average exp)x100

% difference equation

%error=(|experimental-theoretical|÷theoretical)x100

% error equation

h=1/2gt²

atwood machine lab equation for height

false

T or F, the coefficient of friction can be zero, meaning there is no friction between the two surfaces

true

T or F, the total angular momentum of a system of rotating objects is conserved if the vector sum of the torques of all the external forces acting on the system is zero

remain the same

a specific pendulum has a period, T, given by the equation T=(2π/√g)*L^½ If the mass of the pendulum, m, is decreased, the period will...

decrease

a specific pendulum has a period, T, given by the equation T=(2π/√g)*L^½ If the pendulum is moved from the earth where g=9.8m/s² to Jupiter where g=26.0m/s², the period of the pendulum will...

remain the same

a specific pendulum has a period, T, given by the equation T=(2π/√g)*L^½ If the angle is increased from 2 degrees to 4 degrees, the period will...

where the object is located

according to kinematics (x=1/2gt²), the acceleration is dependent only upon...

kinetic friction, as it is the frictional force that slows an object down as it's moving

atwood machine lab for which type of friction are we attempting to compensate for when we add the clay? Why?

a=(m(sub)a÷(M1+M2+m(sub)f+m(sub)a))*g

atwood machine lab magnitude of acceleration equation

This would instead be compensating for static friction, which is the force that must be overcome for another object to start moving. If static friction is accounted for, then the two masses can move on their own

atwood machine lab what would happen to the system if you added clay until it moved on its own?

no

based solely on the angular speed vs time graph, is the total mechanical energy of the platter/mass system conserved? use graph on phone

final L = (Imp+Iap)ωf or (Imp+Ibar)ωf

circular motion lab final angular momentum equation

RKEf=½(Imp+Iap)ω² or ½(Imp+Ibar)ω²

circular motion lab final rotational kinetic energy equation

RKEi=½Iω²

circular motion lab initial rotational kinetic energy equation

Emech=GPE+KE+RKE=mgh+½mv²+½Iω²

circular motion lab mechanical energy equation

No, kinetic energy could have been lost during deformation of the system due to friction during initial contact

circular motion lab was RKE conserved?

kinetic friction between the string/pulley and air resistance

circular motion lab what factors may explain why the total mechanical energy of the main platter and hanging mass was NOT conserved?

inelastic, because KE isn't conserved while angular momentum is. The objects stick together

circular motion lab what kind of collision takes place between the main platter and the auxiliary platter and the main platter and the bar?

initial L = Imp(ωi)

circular motion lab initial angular momentum equation

a curve with an increasing slope

considering our pulley system with a mass falling at a constant acceleration, what should the general shape of its position vs. time graph look like?

a straight line

considering our pulley system with a mass falling at a constant acceleration, what should the general shape of its velocity vs time graph look like?

no

does the mass return to its initial height above the floor at time, t2? use graph on phone

y=1/2gt²

falling bodies lab according to kinematics, the predicted expression for the behavior of the balls as they fall through the air is _________

slope = 1/2g

falling bodies lab in the equation y=1/2gt², slope is equal to...

moving in the positive direction

for velocity vs time graph if the graph is above the t-axis, motion is...

moving in the negative direction

for velocity vs time graph if the graph is below the t-axis, motion is...

-> x = kt², where k is constant -> displacement, x, is proportional to the square of the time, t² -> displacement, x, and time, t, obey a power law

given the kinematics equation for the motion of an object falling from rest, x=1/2gt², what kind of relationship is predicted between x and t?

increasing

if the force applied on an object is greater than the force of kinetic friction, the object will travel with ________ velocity

they will hit at the same time

if you drop a feather and penny in a vacuum (no air resistance), which one would hit the ground first?

the penny will hit first

if you drop a feather and penny in the air, which one would hit the ground first?

- postive slope - straight line - y intercept is zero (goes through origin)

if you plotted x vs t² for an object falling from rest (assuming down to be positive), what should the graph look like?

the slope

in the atwood machine lab, the experimentally determine value of the magnitude of acceleration due to gravity is obtained from the __________

slope=2π÷√g plug slope in from graph and solve for g

pendulum lab equation used to find the experimental acceleration due to gravity for the pendulum

T will increase

pendulum lab what do you think will happen to the period of a pendulum as the length of the pendulum is increased?

T won't be affected

pendulum lab what do you think will happen to the period of a pendulum as the mass of the pendulum is increased?

T will not be affected

pendulum lab what do you think will happen to the period of the pendulum as the displacement of the pendulum is increased?

analysis of graph: - slope equals 0m/s - sign of slope changes from + to - description of motion: - momentarily stops - accelerates in the negative direction

using picture of phone analyze the graph and describe the motion at time t3 for the position vs time graph

analysis of graph: - above the t-axis - moving away from the t-axis - slope is positive and constant description of motion: - moving in the positive direction - speeding up - positive, constant acceleration

using picture on phone analyze the graph and describe the motion at 0-t1 for the velocity vs time graph

analysis of graph: - above t-axis - slope is zero description of motion: - moving in the positive direction - moving at a constant speed - no acceleration

using picture on phone analyze the graph and describe the motion at t1-on for the velocity vs time graph

analysis of graph: - positive slope - magnitude of slope increases description of motion: - moves in positive direction - speeds up - accelerates in positive direction

using picture on phone analyze the graph and describe the motion at time 0-t1 for the position vs time graph

analysis of graph: - positive slope - constant slope description of motion: - moves in positive direction - constant velocity - no acceleration

using picture on phone analyze the graph and describe the motion at time t1-t2 for the position vs time graph

analysis of graph: - slopes are positive - magnitude of slope decreases description of motion: - moves in positive direction - slows down - accelerates in the positive direction

using picture on phone analyze the graph and describe the motion at time t2-t3 for the position vs time graph

analysis of graph: - slopes are negative - magnitude of the slope increases description of motion: - moves in the negative direction - speeds up - accelerates in the negative direction

using picture on phone analyze the graph and describe the motion at time t3-t4 for the position vs time graph

analysis of graph: - negative slope - constant slope description of motion: - moves in the negative direction - constant velocity - no acceleration

using picture on phone analyze the graph and describe the motion at time t4-t5 for the position vs time graph

equal to

using the picture of the graph on your phone:) the gravitational potential energy of the mass, m, at time, t1, is ___________ the gravitational potential energy of the mass, m, at time, t3.

s

what are the units for the period of a pendulum from this equation T=(2π/√g)*L^½

to counter balance the kinetic friction of the system

what is the purpose of the friction rider?