force and motion Flashcards
terminal velocity
velocity remains constant
- resultant force = 0
what 2 factors affect the amount of particle collisions during drag
- surface area
- higher the area, the larger the area
over which collisions can take place
- higher the area, the larger the area
- velocity
- faster they’re moving, more particles
they will collide with
- faster they’re moving, more particles
person falling
- low acceleration = velocity low
- velocity increasing meaning more
collisions with air particles =
resultant force is decreasing due to
air resistance increasing = rate of
acceleration will fall - velocity getting higher = drag the
same size as weight = resultant force
is 0 = stops accelerating = terminal
velocity
newtons first law
if the resultant force on a stationary object is zero, the object will remain stationary. if the resultant force on a moving object is 0, it’ll carrying on moving at the same velocity
newtons second law
a non-resultant force will cause an object to accelerate in the direction of the force
newtons third law
when two object interact, the forces they exert on each other are equal and opposite
stopping distance
minimum distance required to stop a vehicle in an emergency
stopping distance equation
= thinking distance + braking distance
what 2 factors affect the thinking distance
- speed
- faster Ur travelling = further it’ll travel
- reaction time
- tired
- drunk
- drugs
- distracted
thinking distance
time taken to notice the hazard and apply to brakes
braking distance
distance taken to stop after applying the brakes
what are the 3 factors of braking distance
- speed & mass
- these increases the cars kinetic
energy and need to be bought back
to 0
- these increases the cars kinetic
- quality of the brakes
- if faulty it wont be able to slow the
car as quickly increases braking
distance
- if faulty it wont be able to slow the
- traction between car and road
- if road is icy = less friction
