linear motion defs Flashcards
is velocity a scalar or vector
vector
is acceleration a scalar or vector
vector
is weight a a scalar or vector
vector
units for mass
kg
units for displacement
m
units for velocity
m/s
units for acceleration
m/s^2
units for weight
N
units for momentum
kg m/s
kilogram metres per second
is momentum a scalar or vector
vector
definition of mass
Physical quantity expressing the amount of matter or substance in a body from bone muscle fat tissue fluid
the quantity of matter a body possesses
definition of weight
Downward force on a given mass due to gravity, external force, gravitational force that earth exerts on a body by pulling it down to the centre of the earth
acceleration definition
Rate of change of velocity
displacement definition
Length of a straight-line joining start and finishing points
definition of velocity
The rate of change of displacement (how fast)
momentum definition
Product of the mass and velocity of an object
formula for weight
weight=mass x acceleration
formula for acceleration
accel= change in velocity
time
formula for velocity
velocity= displacement/
time taken
formula momentum
momentum=mass x velocity
is weight a vertical or horizontal force
vertical
the greater the mass of the object the …… the weight …… them downwards
greater the weight
pulling them downwards
is displacement a vector or a scalar
vector
what is impulse (def)
define impulse(2)
amount of time a force is applied to an object/body
a measure of force applied over time, impulse = force x time (1)
measured in Newton seconds Ns (1)
impulse can be manipulated to change which 2 things
momentum or velocity
formula for impulse
impulse= force X time
(equates to change in momentum unless zero impulse
what are the units for impulse
Newton seconds (Ns)
is impulse a scalar or vector
vector
what are the units for the axis in an impulse graph
y is force in newtons
x is time in seconds or milliseconds
the acceleration that a performer achieves when sprinting or high jumping is related to impulse, what do you understand by the term impulse and how does the athletes use impulse during their sprint or take off (3)
impulse is force x time
it equates to the change in momentum
there is constant mass
impulse has direction
it represents a single footfall
+impulse for accel at take off
-impulse when foot lands
net impulse positive = accel
could draw an annotated graph
if the length of a race is 1.5km from start to finish in a straight line what is the displacement
1500m
if a race is 40km in a loop what is the displacement
0m
