IB SL Physics Unit 2: Mechanics

d, meters (m), scalar

distance: symbol, units, s/v

s, m @ theta, vector

displacement: symbol, units, s/v

t, seconds (s), scalar

time: symbol, units, s/v

v, m/s, scalar, v=d/t

speed: symbol, units, s/v, equation

v, m/s @ theta, vector, v=s/t

velocity: symbol, units, s/v, equation

a, m/s^2 @ theta, vector, a=(v-u)/t

acceleration: symbol, units, s/v, equation

j, m/s^3 @ theta, vector, j=(af-ai)/t

jerk: symbol, units, s/v, equation

u, m/s @ theta, vector

initial velocity: symbol, units, s/v

v, m/s @ theta, vector

final velocity: symbol, units, s/v

average velocity

velocity over the total time

instantaneous velocity

velocity at a specific time

uniform velocity

unchanging velocity

projectile

an object influenced by gravity only

inertia

Newton’s First Law: the law of ______

inertia mass

(Newton’s First Law) _______ is dependant on ___

acceleration

Newton’s Second Law: the law of

F=ma

(Newton’s Second Law) equation:

force pair

Newton’s Third Law: the law of

for every action there is an equal and opposite reaction

(Newton’s Third Law): statement

kinetic (dynamic) static

two types of friction: _____ ______, ______

normal

F_N = _______ Force

normal force

force 90° to the surface an object is on

R (reactionary force)

F_g = _

mass * gravity

how to find reactionary force (R)

net

F_NET = ____ force

net

the sum of all forces is ____ force

net force

translational equilibrium: what is equal to zero?

okay

study the equations for inclined planes!!

pulley net a

for a ________ use the equation

a=(fg2-fg1)/(m1+m2)

or a=f__/__

energy

the ability to do work or cause change

work

force * displacement, measured in Joules

Joules

N*m = kgm²/s²

Kinetic

energy of motion (.5mu²)

potential

energy due to position or composition (chemical, gravitational, elastic, electric, nuclear, magnetic)

both

internal or mechanical energy: kinetic, potential, or both

power

energy/time = J/s = Watt (W)

Hooke’s Law

F=-kx

Energy final

energy initial is always equal to

efficiency

useful energy/total energy = useful power/total power = 34% KE

combustion engine

CPE; KEf +TEf + sound

dam energy conversions

GPEw →KEw→KEt→EE (electrical energy)

momentum

mass in motion

m*v

p (momentum) =

impulse

an object’s change in momentum

Ft

J (impulse) =

conserved

momentum is __________ in every collision

inelastic collision

KE is not conserved (real life collisions)

elastic collision

KE is conserved