Kinematics Flashcards
(21 cards)
Speed
Rate of change of distance scalar (m/s)
Velocity
Displacement per time interval, vector (m/s)
Distance
Total path length travelled during motion, scalar
Position
Location of an object relative to another object, vector
Displacement
Straight line from initial and final position of something, vector
Average acceleration
Rate of change of velocity over a period of time
Instantaneous acceleration
Rate of change of velocity at a specific point in time
Scalar
Physical description with a magnitude (Temperature, time, distance, speed, mass)
Vector
Physical description with magnitude and direction (velocity, displacement, force, acceleration)
Uniform motion
Constant velocity, acceleration is 0
Non-uniform motion
Changes in velocity and acceleration
Linear motion
Travelling in a straight line, can be uniform or non-uniform, vector and scalar quantities are the same
2-D motion
Motion of an object in a plane requiring two spatial dimension to describe its position
Position-time graph
Slope represents instantaneous velocity
Velocity-time graph
Slope represents instantaneous acceleration area under represents total displacement,
How to read the graph (p-t)
Rest: Straight horizontal line
Constant velocity: Straight horizontal line
Speed up: Diagonal line up
Slow down: Diagonal line down
Direction: Crossing the x-axis
5 variables of Linear uniform accelerated motion
- Acceleration
- Final velocity
- Initial velocity
- Total time
- Total velocity
What is the acceleration of an object during freefall
Usually -9.8 m/s
When an object in freefall reaches its maximum height, what is the final velocity
0 because it is changing directions
When the object comes back to the starting position, what is the displacement
0 because the object has made no net movement
We usually select the start position as the reference point, so any position below the starting position will be regarded as what
Negative because it is technically beneath the reference point
