paper 2 Flashcards
(12 cards)
why does air resistance slow down a projectile
object does work against air resistance. this kinetic energy is converted to heat. slows down
what is meant by the term ‘fluid’
a liquid or a gas
speed of sound
330m/s
walking, running, cycling speed
1.5,3,6
what is newtons first law
if the resultant force is 0 on a stationary object then it will say at rest. if it is 0 on a moving object - constant velocity
what is inertia
the tendency for an object to continue in its rest of movement or rest
what is newtons second law
F=ma
what is inertial mass
a measure of how difficult it is to change a given objects velocity
what is newtons third law
every action has it’s equal and opposite reaction
typical human reaction time
0.2 - 0.9 seconds
two consequences of large vehicles under going large deaccelerations
kinetic energy converted to heat - the break heat up
loss of control of vehicle
what is the unit for momentum
kg m/s
