physics whole unit) Flashcards
how do you calculate sig digits without zeros
you count how many numbers the’re are
how do you calculate sig digits with zeros in front?
you count after the zeros and they dont count as ones
how do you calculate sig digets with zeros after numbers / in between numbers
you would count all the numbers including the zeros
what is the formula for velocity
v= d/t
what is the formula for speed
s=d/t
what is the formula for time
t=d/v
how do you find distance
you add all the numbers together.
how do you find displacement
you add the numbers together and add negatives according to the compus rules
what is displacement
It is the length from the starting point to the ending point and you put the directions
what is distance
distance is the whole length
what is vector and examples of an vector
a vector is a scale that includes direction, for example 15m north
what does scaler mean
a scaler just states the size / amount
how do you calculate the average ———
1) determine if you need to swap units
2) find formula / enter numbers into formula
3) after finding the answer check if the sig digets are correct
what does uniform mean
it stands for the graph increasing in a straight line
what does non uniform mean
it means its not going up at the same pace
what does constant velocity on a position time graph look like
horizontal straight uniform increasing line
changing pace meaning
the pace is constantly changing
how do you find displacement on a graph
by first calculating the area of the square a=bh then the triangle a=bh/2 then adding them
what is the slope formula
slope= y2-y
———
x2-x
what are the two different graphs
distance time graph (scalar)
position time graph (vector)
When there are 2 distances in a acceleration question what formula would you use
You would take away final velocity from initial then divide it by time
potential energy formula
Ep=mgh
kinetic energy formula
EK=1/2mv^2
work formula
W=fd
potential energy rearranged so M mass is the subject
M= ep/gh
potential energy rearranged so H is the subject
H= ep/gm
potential energy rearranged so G is the subject
G= ep/hm
kinetic energy so that v is the subject
v=√2EK/m
kinetic energy so that m is the subject
m=2EK/v^2
what is the formula for force
f= w/d
what is the formula for distance
D=W/F
what are work, Ep, and Ek all measured in
jouls (j)
What is velocity measured in?
m/s
what is gravity in potential energy measured in
m/s^2
What is mass measured in?
kg
What is height measured in?
m meters
in mechanical energy ball positions when the ball is at the first and the last position what type of energy is it
potential energy
in mechanical energy ball positions when the ball is at the middle/bottom/halfway what type of energy is it
it is full kinetic that transferred over
When there are 2 distances in an acceleration question what formula would you use
You would take away final velocity from initial then divide it by time
when there is a question asking for distance and there are only distances what do you do
you add them all up
what do position time graphs find (vector)
velocity
What do distance-time graphs find? (scaler)
speed
What do velocity time graphs find?( vector)
acceleration
with efficiency questions that have jouls in the question as well mentions ek and ep what do you do
you have to look at the other numbers it gives and to either ep or ek to find the input or output then use efficiency to solve
what does increasing acceleration on a velocity-time graph look like
it is a curved line in a smiley face like shape
what does acceleration on a velocity-time graph look like
it is in an increasing line that’s horizontal
in the transfer between kinetic and potential energy where does the energy go
it gets lost to friction
what does Magnitude stand for
size or amount
what does Interval stand for
the difference between two times
Potential energy definition
it stands for energy that is stored
what does altitude stand for
the height relative to to sea level or ground level
when about to drop something what type of energy does it first have
potential then is transferred to kinetic
what does constant velocity on a velocity time graph look like
straight line not increasing or decreasing
what does decreasing velocity look like on a position time graph
it is a curved sad face #emo4life
when would you use the slope
when needing to find the velocity
what does acceleration look like on a distance time graph
a curved line
what way do positive and negative slopes go
positive goes in pos direction
negative goes in a neg direction
what formula do you use when finding displacement
a=bh and a=bh/2
