Topic 5 - 1D Motion: Kinematics Equations [Constant Acceleration] Flashcards
1
Q
What can we analyze with 1D kinematics?
A
- Motion along a straight line β> assume constant acceleration
- Need to define the starting point, and the finish/end point β> must draw a diagram
- Need to define a frame of reference (ie. which direction is positive) from start to finish β> label diagram
- Can then analyze displacement, velocity and
acceleration β> create equations to relate quantities
2
Q
Constant Acceleration
A
When an object moves with constant acceleration, the instantaneous acceleration at any point in time is equal to the average acceleration over the entire time interval
π‘ (itβs constant!)
- We now write acceleration as just π
3
Q
The big 5 Kinematics Equations
A
4
Q
Free Fall
- Note that π (gravity) is a scalar (magnitude only)
- If we want to describe vector acceleration, we can use
π = βπ if the acceleration is downwards
A
When an object is falling under the influence of gravity alone
π= π.π1m
We use a constant gravitational free-fall acceleration of
- Air resistance is negligible and initial motion is disregarded
- Frame of reference will be vertical with (usually) +π¦ pointing up and βπ¦ pointing down
5
Q
Problem Solving Approach to 1D Kinematics
A
- Read the question and highlight was your end goal is (what youβre trying to find)
- Always set a frame of reference and what direction is positive
- Draw a diagram and label all important events (initial/final values, time(s), etc.)
- Make a list of all known/unknown variables β pick which kinematics equations to use
- Apply the proper kinematics equations and solve for desired variable