StainlessInc

Scalar vs. Vector Quantities: 

• Scalar: measure magnitude (size) - ex. distance and speed

• Vector: measure magnitude and direction - ex. velocity, acceleration, force, work, power...

  • To add vectors, connect the tails to the heads of the vectors, creating the resultant vector 

 

Average vs. Instantaneous Speed: 

• Average speed: the total distance of an object over the total time

• Instantaneous speed: this refers to the velocity of an object at a specific moment in time

 

Constant Velocity vs. Constant Acceleration: 

• Constant velocity: constant speed of an object in the same direction (acceleration is 0)

• Constant acceleration: occurs when the change in velocity of an object is constant

  • A measure of constant velocity --> 3 m/s (in a certain directon)

  • A measurement of constant acceleration --> 3 m/s/s (velocity increases by 3 m/s every second

 

**Acceleration rate due to gravity: -9.81m/s/s

 

Free Fall vs. Falling with Air Resistance: 

• Free Fall: only force acting on an object is gravity

  • If any other force (like air resistance) is acting on the falling object, it's not in free fall

    • Pure free fall is impossible in most places on Earth (you'd need a vacuum), but oftentimes air resistance is negligible

    • Still free fall if object is going up as long as gravity is the only force

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Kinematic Equations:

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Graphs of Motion:

• Main graphs of motion:

  • Displacement/time, velocity/time and acceleration/time​

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