P10 Flashcards
newtons 2nd law
force= mass x acceleration
recoil equation
mA vA + mB vB = 0
law of conservation of momentum
momentum before the event is equal to total momentum after the event (in. a closed system)
extension of an object
final length - original length of object
impact force equation
change of momentum / impact time
braking force of vehicle
force= mass x acceleration
resultant force at terminal velocity
0
terminal velocity definition
maximum velocity an object reaches when free falling
weight = frictional force on object
equation linking speed,distance and time
speed= distance / time
equation linking extension, force and spring constant
force= spring constant x extension
f=ke
newton’s third law
when two objects interact, the forces they exert on each other are equal and opposite
newton’s first law
velocity of an object will only change if a resultant force is acting on the object
factors affecting braking distance
icy/ wet roads conditions of brakes conditions of tyres weather conditions speed car is travelling
factors affecting thinking time
alcohol/ drug use distractions mobile phone use tiredness speed of vehicle
is momentum vector or scalar
vector
has magnitude and direction
