# Physics I

## 70 terms

Meter (m)

Kilogram (kg)

Newton (N)

Second (s)

Joule (J)

Watt (W)

Ampere (A)

Kelvin (K)

Mole (m)

Liter (L)

Angstrom (A)

Nanometer (nm)

### SI unit subatomic level Energy

Electron Volt (eV)

giga (G)

mega (M)

kilo (K)

centi (c)

milli (m)

micro (m)

nano (n)

pico (p)

0

1/2

sqrt2/2

sqrt3/2

1

0

1

sqrt3/2

sqrt2/2

1/2

0

-1

v cos theta

v sin theta

### How do you find the magnitude of the resultant vector and direction of theta if you are given several vectors?

1. Resolve the vectors using the x and y components 2. Add all the x components together and all the y components together 3. Find the magnitude of the resultant using r=sqrt y^2 + x^2 4. Find the direction of theta using tan theta = y/x

### Displacement

Vector. Change in an objects position

### Velocity

Vector. m/s. Change of displacement over change in time

### Speed

Scalar. Actual distance traveled over change in time

### Instantaneous speed

Scalar. Magnitude of the instantaneous velocity

### Instantaneous velocity

Average velocity as the change in time approaches 0

### Acceleration

Vector. Change of velocity over change in time

### Instantaneous acceleration

Average acceleration as change in time approaches 0

### Average acceleration

Change in instantaneous velocity over change in time

### 6 linear motion equations

1. V=Vin+at 2. lineV=Vin+V/2 3. Vsq=Vin)+2a^2(x-xin) 4. X-Xin=Vint+at^2/2 5. X-Xin=lineVt 6. X=Vxt

### Weight

Vector. Measure of gravitational force on mass

### Mass

Scalar. Its the amount of matter an object has

initial velocity

### Newtons First Law

F=ma=0 A body at rest or in constant motion will remain that way unless a force acts on it

### Newtons Second Law

sumF=ma Force applied to a body will cause the body to accelerate in that direction only if the sum of all forces do not equal zero

### Newtons Third Law

Fb=-Fa To every action there is an equal and opposite reaction

F=Gm1m2/r2

### What 2 things should be remembered about the gravitational force equation

F is inversely proportional to r2 and if r is halved then F is quadrupled.

### Translational Motion

Motion where there is no rotation

### Rotational Motion

Forces applied to an object cause the object to rotate around a fixed point (fulcrum)

### Torque

Application of force at some distance from a fulcrum generates torque causing the object to undergo rotational motion.

### Torque equation

t=rFsintheta r is the distance between the fulcrum and point of force, theta is the angle between the F and the lever arm

Zero

### In uniform circular motion, what is the magnitude of the tangential force? and why?

Zero because there is no change in speed of the object because its constant.

### What is the resultant force of an object moving in uniform circular motion?

The radial force because the tangential force is zero

resultant force

F=mvsquared/r

a=vsquared/r

### What are the two kinds of friction?

Static friction (not moving) and Kinetic friction (moving)

0<Fs<MsFn

### Static friction

occurs between a stationary object and the surface that it rests on

Fk=MkFn

### Kinetic friction

occurs between a sliding object and the surface that its sliding on

### How are the Kinetic friction and Static Friction equations different?

The kinetic friction equation has an equal sign the static friction equation has a less than or equal to sign meaning kinetic friction will have constant value for any given combination of coefficient of kinetic friction and normal force

### Which will have a higher maximum value static friction or constant kinetic friction?

static friction it takes more force to move something than to get an object to slide and keep it sliding