Lab Equipment & FR
What equipment do we use to measure mass?
Mass Scale
What two things do we look at in an unfamiliar scenario problem?
1. Check which variables are on the numerator vs denominator
2. Check what the exponents are on each variable
What is the true about the forces between two objects if one of the objects is accelerating?
The forces are ALWAYS equal (Newton's 3rd Law)
Write down our rules for relating the three types of kinematics graphs (hint: this is a diagram)
A
V
X
How do we calculate the force of gravity?
F_g=mg
What phrase (or sentence stem) do we use when describing a measurement?
"Measure _____ with _____ "
On a lab design question, what do we always conclude a procedure with?
Multiple trials (at least 10) and changing the independent variable
What is the true about the center of mass velocity in a collision in which two objects stick together.
It is equal to the final velocity (and stays the same)
A ball is dropped and falls to the ground. How does the energy of the ball change?
The energy of the ball increases since it gains kinetic energy. (The energy of the ball-Earth system stays constant since Ug is converted to K)
What is the equation for conservation of momentum?
p_1+p_2=p'_1+p'_2
What piece of equipment do we use to measure velocity or acceleration?
Motion Tracker
What two things should we do before we start writing a paragraph-length response?
Identify the major topics and brainstorm key points/ideas/equations to include
A ballerina is spinning and extends her arms, what happens to her motion?
What are the four types of "collisions" and the key point to remember for each?
Inelastic - bounce apart
Elastic - bounce apart, K is conserved
Totally Inelastic - stick together, same final velocity
Recoil - push apart, same initial velocity
What is the equation for gravitational field strength near a planet?
g=GM/r^2
When should we use a graph in analyzing the results of a lab?
When we want to evaluate the relationship between two variables.
How do you start a derivation?
Identify and write a relevant equation on the reference sheet or a fundamental physics principle.
Use
T=1/f
and
T=2pisqrt(l/g)
How do the x and y components of a force change as the angle of the force increases?
The x component decreases, the y component increases
How do we calculate the average velocity of an oscillator in simple harmonic motion?
v_m=(4A)/T