Forces and Motion Flashcards
what does the gradient of a distance time graph show?
speed
what does the gradient of a speed time graph show?
acceleration
what does the area under a speed time graph show?
distance. travelled
what is mass?
the amount of matter in a body measured in kilograms
what is weight?
a FORCE measured in newtons
what is reaction force?
acts perpendicular to a surface
which direction does gravity and weight act in?
downwards
what is thrust?
push or pull due to engine
what is drag, air resistance or friction?
slows things down, opposes motion
how can you reduce friction?
put a lubricant between the surfaces
how do you reduce resistance and drag in fluids?
keep the shape of the objects streamlined
what are the three laws of motion?
balanced forces means no change in velocity
a resultant force means acceleration
an objects exerts an equal and opposite force to the one that is being applied to it
what is a vector?
has size and direction
what is a scalar?
only has a size
give some examples of vectors
force
velocity
acceleration
momentum
give some examples of scalars
mass
temp
time
what is terminal velocity?
if there is no resultant force an object will move at a constant velocity. if there is no drag it will accelerate at 10 m/s2
what is acceleration of freefall?
all objects in freefall accelerate at 10m/s2
what does the terminal velocity of an object depend upon?
the objects shape and area
what is Hooke’s Law?
extension is proportional to force
can a material return to its original shape after an elastic deformation?
yes
what is the stopping distance equation?
thinking distance + braking distance
what affects thinking distance?
speed
tiredness
alcohol
what affects braking distance?
speed
road surface
tyre surface
tyre condition
