Definitions
define kinematics
what is the study of how things move?
define scalar and vector
scalar- quantities that only consist of magnitude, or size
vector- quantities that include both magnitude and direction
speed formula
distance over time
how can we describe where an object is?
using measurements such as distance and displacement
what is a frame of reference?
the point from which you are viewing an object
define distance
how far an object travels during a time interval
what is speed
scalar
velocity formula
displacement over time
how can we study motion?
We can graph speed and velocity to draw conclusions about the relationships of motion
why do we study newtonian mechanics when there are more workable models available?
They are the easiest to comprehend, and they only focus on one object at a time.
define displacement
a change in position
what is velocity
vector
momentum formula
mass times velocity
how do objects move in the real world?
they accelerate, both positively and negatively, with external forces acting on them such as gravity. also, they can use circular motion, which causes centripetal acceleration.
how can distance be greater than displacement, but displacement can't be greater than distance?
define speed
the distance travelled in an amount of time
what is distance
scalar
acceleration formula
what causes a change in motion?
external forces such as gravity, friction, air resistance, and applied force.
why are m/s2 the unit for acceleration?
since the formula for acceleration is change in velocity over time, and the formula for velocity is displacement over time, you have time in the denominator twice, hence why the formula is meters per second squared.
define velocity
the rate at which an object's position changes
what is acceleration
vector
gravitational acceleration formula
mass times 9.81 m/s2
how can we predict changes in motion?
using newtons laws, such as the law of acceleration, inertia, and action-reaction.
compare linear, circular, and projectile motion.
linear- an object in motion will remain in motion unless acted on by outside forces, moves in a straight line.
circular- this motion is caused by centripetal acceleration, this is accelerating because the velocity is constantly changing although the speed is constant
projectile- this motion would be a perfect parabola if no forces acted on it other than gravity, but due to air resistance, the distance is a little bit shorter than predicted