forces and motion 1 Flashcards
what is a scalar & an example of it?
has only magnitude:
speed
distance
what is a vector & what’s an example of one?
magnitude and direction:
velocity
displacement
force
equation for speed?
speed = distance / time
equation for velocity?
velocity = displacement(distance) / time
what is speed measured in?
m/s
what is acceleration?
the rate of change in velocity
what is the equation for acceleration?
acceleration = change in velocity / time
what’s on the y axis and x axis of a distance time graph?
y - distance
x - time
what does the gradient of the line in a distance time graph tell you?
the speed
what does a / line suggest in a distance time graph?
constant speed
what does a - line tell us in a distance time graph?
stationary
how do you find the gradient of a curved line?
draw a tangent to the line
what’s on the y and x axis of a velocity time graph?
y - velocity
x - time
what does the gradient of a velocity time graph tell us?
acceleration
what does / mean in a velocity time graph?
constant positive acceleration
what does a - line mean in a velocity time graph?
velocity is constant
how do you find the distance travelled in a velocity time graph?
find area under the curve
what’s the first law of motion (newton)?
a resultant force is required to change the motion of an object
what is (newtons) second law of motion?
if a resultant force acts on an object it will cause the object to accelerate
newton’s second law
the size of the resultant force is…
directly proportional to the acceleration it causes
what is the equation for force?
force (N) = mass(kg) x acceleration(m/s2)
what is acceleration messaged in?
m/s^2
what is force messaged in?
N newtons
what’s newton’s third law?
when two objects interact the forces they exert on each other are equal (magnitude) and opposite (direction)
if you are pushing a box -> 100N however the box will push back <- 100N (normal contact force)