Physics Exam 1 Flashcards
Newtons FIRST Law
- Inertia: an object stays in motion in a straight line with constant velocity and will remain as such UNLESS acted upon by a net, eternal force
Newtons SECOND Law
1) F = ma which is known to be law of force and acceleration.
2) a force upon an object causes it to accelerate according to the formula net
3) Force = mass of an object * Acceleration
Newtons THIRD Law
1) Equilibrium
2) Having an equal and opposite force acted upon itself to equal out both forces making them have an equal magnitude.
Kinematics
1) Kinematics is the study of the motion of mechanical points, bodies and systems without consideration of their associated physical properties and the forces acting on them.
Kinematics Equations (basics)
1) v = v 0 + a t.
2) Δ x = ( v + v 0 2 ) t.
3) Δ x = v 0 t + 1 2 a t 2.
4) v 2 = v o 2 + 2 a Δ x
Scientific Method
- Recognize a question or problem.
- Make an educated guess- a hypothesis - as to answer
- Predict the consequences that should be observed if the hypothesis is correct and that should be absent if the hypothesis is not correct
- Perform expts to see if the predicted consequences are present
- Formulate the simplest general rule that organizes the three ingredients- hypothesis, predicted efforts, and experimental findings
Mass vs Weight Equations
- To find acceleration: f=ma
- To find the missing side of a parallelogram: Form the three sides the the doted middle line you use c^2=a^2+b^2
(Right triangle) - 1st equation v = v0 + at velocity-time
2nd equation s = s0 + v0t + ½at2 position-time
3rd equation v2 = v02 + 2a(s − s0) velocity-position
merton rule v = ½(v + v0) average velocity
Kinetic Energy Formula
K.E = 1/2 m v^2
Vectors
“VECTOR! THATS ME COMMITING CRIMES!! WITH BOTH DIRECTION AND MAGNITUDE!!!!!”
Useful Vectors:
Position: (m)
Velocity: (m/s)
Acceleration: Change vector/change time=(m/s)/s=m/s^2
triangle x is what?
Change Distance
Triangle T is what?
Change Time
Vf means what?
Velocity * force
m/s^2 is what?
Meters per second square
XF is what?
Is distance * force
Vi is what?
Velocity 1 or first velocity
what does x always represent?
DISTANCE!!
Average Speed formula
D/t = x/t
(distance over time thus is the same as x over time)
How to find the v total in a parallelogram?
v total^2 = v^2 + v_c^2
V total is square rooted by the 1st v ^2 then by the v for c ^2
CLEAR AS MUCK?!?
YES!!! (._. )
Conservation Laws
- Matter
- Charge
- Momentum
- Energy
P is what?
MOMENTUM!!
Pi is what??
FIRST momentum
Pt is what???
FINAL momentum
what is the formula for WORK
WORK = Force * distance
What is h?
HEIGHT
What is M?
MASS
What is g?
GRAVITY
What is the theory of relativity?
E=mc^2
KE=?
KE=1/2 * mv^2
Speed of light formula
C=3x10 * 8m/s
What was the example for Kinetic Energy ??? ENERGY OF MOTION
THE PEN!!
properties:
- friction
- heat
- sound
- vibration
WHAT IS KENETIC ENERGY??!
ENERGY OF MOTION!!
Are Velocity and Speed the SAME?
NO!
Velocity meaning also changing DIRECTION
SPEED IS A FORCE!
What is the calculation or number for g? (gravity)
9.8m/s^2
How do you find N?
kg * km^2= N
How do you find m/s^2?
Divide N FIRST by kg.
How do we find kg?
N DIVIDED BY m/s^2
Say there are two train cars, one stationary and the other is going towards this stationary cart at a v and so they both start to move. What is then the v they are at? How do we find this?
So MASS * Velocity = 2m v^1
then its v/2=v^1 which in simple sense means it now no longer moves at its original speed, now both carts move at half the speed it started with. Hence the fraction.
If something moves (bounces) back after being thrown what is the momentum ?
Well if it bounces back that means its a form of elastic, which means in theory the momentum is conserved which means it doesn’t go down it instead goes UP. Thus DOUBLING what we started with. (remeber to use Pi to start and Pf to finish)
YOU GOT THIS DUDE!
If you say so..
How to find momentum?
you multiply the MASS by any current vector
