PHYSICS LT #2

hellauu for those using this, i recommend using the "learn" function & changing the settings to answering w/ definition ++ flashcards option only :>>

What is Mechanics

study of the motion of objects, and the related concepts of force and energy

Two Types of Mechanics

Kinematics & Dynamics

What is Kinematics

description of “how” objects move

What is Dynamics (aka kinetics)

Deals with force and “why” objects move as they do

[FORMULA] Average Speed

(distance traveled) / (time elapsed)

[FORMULA] Average Velocity

What is Instantaneous Velocity

the velocity at any instant of time

[FORMULA] Instantaneous Velocity

[FORMULA] Average Acceleration

[FORMULA] Instantaneous Acceleration

What is deceleration? How do you know if an object is decelerating?

when the acceleration vector is opposite to the direction of motion (nothing to do with the sign of acceleration on its own, look at the signs of BOTH)

[KINEMATIC EQUATION] Final velocity as a function of time

v = v₀ + at

[KINEMATIC EQUATION] Final velocity as a function of displacement

v² = v₀² + 2a△x

[KINEMATIC EQUATION] Displacement as a function of time

△x = v₀x + ½ at²

What is a Displacement-Time Graph

Shows an object’s displacement as a function of time: (time = x axis, displacement = y axis)

[DISPLACEMENT-TIME GRAPH] How is the object moving?

At Rest

[DISPLACEMENT-TIME GRAPH] How is the object moving?

Constant Speed, Positive Direction

[DISPLACEMENT-TIME GRAPH] How is the object moving?

Constant Speed, Negative Direction

[DISPLACEMENT-TIME GRAPH] How is the object moving?

Increasing Speed, Positive Direction

[DISPLACEMENT-TIME GRAPH] How is the object moving?

Increasing Speed, Negative Direction

[DISPLACEMENT-TIME GRAPH] How is the object moving?

Decreasing Speed, Positive Direction

[DISPLACEMENT-TIME GRAPH] How is the object moving?

Decreasing Speed, Negative Direction

Slope of Displacement Time Graph is…

Average Velocity

What is a Velocity-Time Graph

Shows an object’s velocity as a function of time (time=x axis, velocity=y axis)

[VELOCITY-TIME GRAPH] How is the object moving?

At Rest

[VELOCITY-TIME GRAPH] How is the object moving?

Constant Speed, Positive Direction

[VELOCITY-TIME GRAPH] How is the object moving?

Constant Speed, Negative Direction

[VELOCITY-TIME GRAPH] How is the object moving?

Increasing Speed, Positive Direction

[VELOCITY-TIME GRAPH] How is the object moving?

Increasing Speed, Negative Direction

[VELOCITY-TIME GRAPH] How is the object moving?

Decreasing Speed, Positive Direction

[VELOCITY-TIME GRAPH] How is the object moving?

Decreasing Speed, Negative Direction

How to get acceleration from velocity-time graph?

Get its slope !

How to get displacement of the velocity-time graph?

Area under the curve !

What is an acceleration-time graph?

Shows the object’s acceleration as a function of time (x-axis = time, y-axis = acceleration)

[ACCELERATION-TIME GRAPH] How is the object moving?

EITHER: At rest or Constant Speed (positive or negative)

[ACCELERATION-TIME GRAPH] How is the object moving?

EITHER: Increasing Speed, Positive Direction OR Decreasing Speed, Negative Direction

[ACCELERATION-TIME GRAPH] How is the object moving?

EITHER: Increasing Speed, Negative Direction OR Decreasing Speed, Positive Direction