Linear kinematics Pt II and kinetics Flashcards
Describe the difference between distance travelled and displacement and give an example of a sporting event in which the magnitudes are the same and different.
Distance travelled is a scalar quantity that does not account for direction - eg straght 50m race
Dsplacement accounts for the direction eg - 400m race along circular track
Which of the following is not a characteristic used to
describe linear motion?
a) velocity b) position c) speed d) displacement e) force
force
What is the rate of motion?
speed
is speed scalar or vector?
scalar
what is velocity?
the rate of motion in a specific direction
what is acc?
he rate of change of velocity
e.g., 2m/s2 north (SI units are m/s2)
for every second that passes, the velocity will
increase 2m/s north; i.e., an object with a velocity
of 10m/s [N] will have a velocity of 12m/s [N] after
what is uniform accelaration? describes what motion?
accc. of object is constant - motion of projectile - 9.81m/s
What is projectile motion?
motion of an object which is propelled into
the air or dropped and has only the forces
of gravity and air resistance acting on it
at peak heigh what is velocity
0
at dropped object what is is the start position and velocity?
they both equal 0 - y1 and v1
A launched objects has a V2 of ____
0 - at apex at max height r time to max heigh
time to peak = max hight then ttoal flight would be
multiplied by 2
is horizontal motion of projectile constant?
yes therfore horiz acc is also 0
what is kinematics vs kinetics?
Kinematics is the description of motion wheras =kinetics is the forces that cause the change in motion
What is newtons first law?
1 = law of inertia - an obejct at rest or constant celocity in straight line will stay the same unless acted by extrnal force - applies to delta f and components
