Physics Exam 1

Question 1

Newtons FIRST Law

Answer 1

1. 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

Question 2

Newtons SECOND Law

Answer 2

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

Question 3

Newtons THIRD Law

Answer 3

1) Equilibrium
2) Having an equal and opposite force acted upon itself to equal out both forces making them have an equal magnitude.

Question 4

Kinematics

Answer 4

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.

Question 5

Kinematics Equations (basics)

Answer 5

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

Question 6

Scientific Method

Answer 6

1. Recognize a question or problem.
2. Make an educated guess- a hypothesis - as to answer
3. Predict the consequences that should be observed if the hypothesis is correct and that should be absent if the hypothesis is not correct
4. Perform expts to see if the predicted consequences are present
5. Formulate the simplest general rule that organizes the three ingredients- hypothesis, predicted efforts, and experimental findings

Question 7

Mass vs Weight Equations

Answer 7

1. To find acceleration: f=ma
2. 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)
3. 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

Question 8

Kinetic Energy Formula

Answer 8

K.E = 1/2 m v^2

Question 9

Vectors

Answer 9

“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

Question 10

triangle x is what?

Answer 10

Change Distance

Question 11

Triangle T is what?

Answer 11

Change Time

Question 12

Vf means what?

Answer 12

Velocity * force

Question 13

m/s^2 is what?

Answer 13

Meters per second square

Question 14

XF is what?

Answer 14

Is distance * force

Question 15

Vi is what?

Answer 15

Velocity 1 or first velocity

Question 16

what does x always represent?

Answer 16

DISTANCE!!

Question 17

Average Speed formula

Answer 17

D/t = x/t
(distance over time thus is the same as x over time)

Question 18

How to find the v total in a parallelogram?

Answer 18

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

Question 19

CLEAR AS MUCK?!?

Answer 19

YES!!! (._. )

Question 20

Conservation Laws

Answer 20

1. Matter
2. Charge
3. Momentum
4. Energy

Question 21

P is what?

Answer 21

MOMENTUM!!

Question 22

Pi is what??

Answer 22

FIRST momentum

Question 23

Pt is what???

Answer 23

FINAL momentum

Question 24

what is the formula for WORK

Answer 24

WORK = Force * distance

Question 25

What is h?

Answer 25

HEIGHT

Question 26

What is M?

Answer 26

MASS

Question 27

What is g?

Answer 27

GRAVITY

Question 28

What is the theory of relativity?

Answer 28

E=mc^2

Question 29

KE=?

Answer 29

KE=1/2 * mv^2

Question 30

Speed of light formula

Answer 30

C=3x10 * 8m/s

Question 31

What was the example for Kinetic Energy ??? ENERGY OF MOTION

Answer 31

THE PEN!!
properties:
- friction
- heat
- sound
- vibration

Question 32

WHAT IS KENETIC ENERGY??!

Answer 32

ENERGY OF MOTION!!

Question 33

Are Velocity and Speed the SAME?

Answer 33

NO!
Velocity meaning also changing DIRECTION
SPEED IS A FORCE!

Question 34

What is the calculation or number for g? (gravity)

Answer 34

9.8m/s^2

Question 35

How do you find N?

Answer 35

kg * km^2= N

Question 36

How do you find m/s^2?

Answer 36

Divide N FIRST by kg.

Question 37

How do we find kg?

Answer 37

N DIVIDED BY m/s^2

Question 38

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?

Answer 38

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.

Question 39

If something moves (bounces) back after being thrown what is the momentum ?

Answer 39

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)

Question 40

YOU GOT THIS DUDE!

Answer 40

If you say so..

Question 41

How to find momentum?

Answer 41

you multiply the MASS by any current vector