kinematics in one dimension Flashcards
kinematics vs dynamics
kinematics -deals with the concepts that are needed to describe motion
“what” - speed, position n acceleration
dynamics - deals with the effect that forces have on motion
“why” - forces and masses
tgt, kinematics and dynamics from the branch of physics known as mechanics
scaler magnitude vs vector quantities
scaler magnitude:
have magnitude but no direction
(distance, speed, mass, energy, density)
vector quantities:
have magnitude and direction
(displacement, velocity, weight, acceleration)
it is a vector that points from an object’s initial position to its final position and has a magnitude that equals the shortest distance between the two positions.
displacement
si unit of displacement
meter (m)
formula t0 find displacement
delta x = final - initial position
in a displacement question. what should you find
displacement is a vector
1. magnitude, “distance” - use Pythagoras theorem to find the displacement
2. direction - use trigometric functions (soh cah toa) to find the angle
average speed is the distance traveled by the time required to cover the distance
speed and velocity
si unit for speed
meters per second (m/s)
formula to find average speed
distance / time
delta means
change
formula to find average velocity and si unit
final displacement - initial displacement / final time - initial time (m/s)
the magnitude of the instantaneous velocity is called the
instantaneous speed
the difference between speed and velocity
speed - tells you how fast (scalar quantities)
velocity - tells you how fast AND in what direction (vector quantities)
instantaneous velocity
how fast it moves
direction of the motion at EACH INSTANT OF TIME
formula to find acceleration (si unit)
final velocity - initial velocity / final time - initial time (km/h or m/s)
