Final Flashcards
Rule for calculating sig figs in addition problems
The answer have the same number of decimals as the least precise value.
After a projectile is fired horizontally, what direction is exhibiting non zero acceleration?
Along the y-axis
If the smallest units on your measuring tape is cm, what precision should your measurement be written?
Millimeters
T or F. The height of the projectile launcher Yo has no effect on the range projectiles
False
T or F. If an object is in static equilibrium, it has zero acceleration.
True
A lab report conclusion should incorporate
An evaluation of an stat error in the experiment
An evaluation of any systematic error
A statement and discussion of your results including specific data points.
The least count of a measurement device refers to
The most precise point of precision on the instrument scale
For a function S=x+y, what is the formula for calculation ΔP?
ΔΡ/P = sqrt(Δx/x)^2 + (Δy/y)^2
If a force of 20.0 N is applied tangentially to the rim of the cylinder of radius 4.1cm calculate the magnitude of the torque it produces.
τ=Fd
= (20N) (0.041m)
= 0.82 Nm
0.82 torque is opposed by kinetic friction of 0.100 Nm. What is the magnitude of the net torque on the cylinder?
Tnet = 0.82Nm - 0.1Nm
= 0.72 Nm
If the linear acceleration at the point of application of the force is measured at 0.00230 m/s^2, what is the angular acceleration? radius 0.041m
α = αt/r
0.0030m/s^2 / 0.041m rad / s^2
= 0.0561 rad / sec^2
Radon or stat errors can be described as
Errors that can arise from many small uncontrolled effects
In an experiment human error refers to
Uncorrected mistakes made by the person performing the procedure
Systematic errors means
Consistently biased errors that might be due to a flaw in the instrumentation
For Gaussian distributed random errors, what percentage of the measurements will be within two standard deviations of the mean?
95%
In the equation Vo = ((m+M)/m)V the term M represents
The mass of the pendulum
The momentum of an object can be defined as
The product of mass and velocity
In the eq. Vo = ((m+M)/m)V, Vo represents
Initial velocity of the ball before impact
In the eq. Vo = ((m+M)/m)V, V represents
The final velocity of the combined ball/pendulum system after impact
What is the native angular mode of Excel?
Radians
How many sig figs would you use for the results 102 - 4.18
2
How many sig figs would you use for the results 32.85 x 4.18?
3
Precision and accuracy in scientific measurement are different concepts T OR F
True
Percent error or percent difference are the same thing T or F
False
A good table should have a descriptive title and table number T OR F
True
Torque can be define as
T = dF
The tendency of a force to produce rotation
A rigid body is said to be in equilibrium
If it is not accelerating or changing its rate of rotation
A scale that reads 2g when nothing is on it is an example of
Systematic error
The resolution of a scale (the limit of its precision) is an example of
Statistical error
When performing a well made experiment, the experimenter
Takes careful record of the uncertainty of measurements
Changes one variable at a time to see how it affects the outcome
Takes time to understand the meaning behind each part of the experiment
In circular motion, if an object with constant mass is being acted upon by a fixed amount of centripetal force, and is moved out to a larger radius, it will increase velocity T or F
True
The further a spring stretches from its rest position, the weaker the force. T or F
False
The period of circular motion is the time it takes to rotate 320 degrees T or F
False
What is the average velocity of an moving object?
The displacement of an object over the change of time in which that displacement occurred
Percent error is
An evaluation of a measurement’s difference from a predicted or expected value
For a graph of velocity vs time where acceleration is uniform, how do you derived a value for acceleration?
Slope
Percentage difference is
An evaluation of the difference two measurements
What are the properties of a vector?
Magnitude
Direction
They can be added together
The resultant of two or more forces acting on an object is the vectors sum of those forces T OR F
True
An experiment turns out an average measurement of 180+-43 compared to a known value of 180.106. This measurement would be
Accurate but not precise
Random error tend to follow a Gaussian distribution T OR F
True
The standard deviation and the standard deviation of the mean are the same T or F
False
Accuracy and precision are exchangeable T or F
False
The potential energy of the pendulum at the top of its swing should be greater than its kinetic energy in the instant after impact. T or F
True
Measured or calculated values should always have the same minimum precision as their uncertainties. T or F
True
Two forces acting in the same direction can generate opposing torques. T or F
True
If a rigid body is rotating at a constant speed, it has a constant, non zero net torque acting on it. T or F
False
A percent error is a source of statistical error. T or F
False
How many sig figs 10,040?
4
How many sig figs? 10.040
5
How many sig figs? 0.0010040
5
If you want to turn the cell reference C4 into an absolute cell reference, how would you type it into excel?
$C$4
Centripetal force is
The force producing inward radial acceleration in a circular motion
Systematic error is associated with
Biased imperfections in measuring devices
Units of moment of inertia are
Kgm^2
Torque has units of
Nm
mN
Kg(m/s)^2
3 sig figs for 23951.5558
24000 (bar over first 0)
Moment of inertia can be thought of as
The rotational equivalent of mass
If you are asked to plot A vs B, A represents
The variable on the Y axis
An object undergoing uniform acceleration will producer a linear velocity vs time graph with a slope of zero. T or F
False
Uncertainty is commonly rounded to one sig fig as standard practice. T orF
True
The resultant is
The force equivalent to two or more forces
The equilibrant
A force required to put an object in static equilibrium
Weight is
A vector
