Science - Physics Pt. 2 Flashcards
mass
kg
distance/length
m
speed/velocity
m/s
acceleration
m/s^2
time
s
gravitational field strenght
newtons (N)/kg
momentum
Kilogram meters (Kgm)/s
force
newtons (N)
mechanical force
spring pushing a trolley
gravitational force
ball falling to earth
electrostatic force
electrons orbiting a nucleas
magnetic force
compass points north
nuclear force
protons & neutrons held together in a nucleas
equations of motion
- solve motion problems with constant/uniform acceleration
v = u + at (t)
v = u^2 + 2as (distance (s))
s = ut + 1/2 at^2 (v)
balanced force
forces acting on sometime are balanced and object does not change its moving
unbalanced force = 0
forces acting on object is the same value as force acting in opposite direction
why does skidding occur
brakes are applied too hard - tires cannot grip surface
friction
occurs when solid objects rub against other solid objects or when moving though liquids/gases
how do friction help
increase friction for bikes and cars when applying brakes - between rotating wheels and body of vehicle
things friction between tires and road depend on
- road surface
- thread of tires
- weight of vehicle
how does alcohol affect your driving
- slows brain function
- gives you false confidence
- harder to multitask
- make you feel sleepy/fatigued
- reduces ability to judge how fast you’re moving/distance
BAC
blood alcohol concentration
drugs on alcohol
multiply affect and increases risk of crashing even in small concentrations
motorcyclists on alcohol
greater risk of crashing as they are more unbalanced
help you sober and drive
time
blood alcohol limits
learner, p1, p2 - 0
‘black’ licence drivers - 0.02
why are crashes slowly reducing
- speed cameras
- graduated licensing
- RS 2000 strategy RBT
- road safety strategy
- stricter rules
