A-LEVEL Physics: 4.3.1: Motion Along a Straight Line (SaveMyExams) Flashcards
Scalar Quantities Only have…
Magnitude.
Vector Quantities have Both…
Direction & Magnitude.
Velocity = …
Change in Displacement / Time Taken
v=∆s/∆t
Acceleration = …
Change in Velocity / Time Taken
a=∆v/∆t
What is ‘Instantaneous Speed/Velocity’?
Instantaneous Speed/Velocity is the Speed/Velocity of an Object at Any Given Point in Time.
The Instantaneous Velocity of an Object Can be Taken for an Object at a ___ ___, or ___.
Constant Velocity, Accelerating.
What is Acceleration Shown as on a Displacement-Time Graph?
Line Curved Upwards.
An Accelerating Object Will have a Changing ___. Why?
Velocity. Because Velocity is ∆s/∆t, so if the Object is Accelerating, its Change in Displacement (∆s) Increases. Therefore, Velocity Increases.
How do you Find the Instantaneous Velocity on a Displacement-Time Graph?
Draw a Tangent at the Required Time.
Calculate the Gradient of that Tangent. (Gradient = Velocity (∆s/∆t))
How do you Find the Average Velocity on a Displacement-Time Graph?
Average Velocity = Total Displacement / Total Time
The 3 Types of Graphs that can Represent Motion: (3)
-Velocity-Time Graph
-Displacement-Time Graph
-Acceleration-Time Graph
What does the Gradient of a Displacement-Time Graph Represent?
Velocity.
What does the y-Intercept of a Displacement-Time Graph Represent?
Initial Displacement.
What does a Straight Line Represent in a Displacement-Time Graph Represent?
Constant Velocity.
What does a Positive Slope Represent in a Displacement-Time Graph?
Motion in the Positive Direction.
