# Shared Flashcard Set

## Details

Dynamics
Velocity-Time and Displacement-Time graphs
27
Physics
Not Applicable
08/07/2005

Term
 What is speed?
Definition
 Distance moved in a given timeIn science the time unit is usually a second. Therefore speeds are measured in metres per second (how many meters travelled in one second).
Term
 What is the equation used to calculate speed?
Definition
 speed = distance travelled/time taken speed is measured in metres per second (m/s) distance in metres (m) time in seconds (s)NOTE: the abbreviation for seconds is 's' NOT secs!!! Leave sex to the biologists!
Term
 What is velocity?
Definition
 The vector form of speed.
Term
 What is a vector?
Definition
 A vector has magnitude (in other words - size) AND direction.This makes it different from a scalar quantity which only has size!
Term
 What is a scalar quantity?
Definition
 One that only has magnitude (size).It differes from a vector which has direction associated with it too.
Term
 What equation do you use to calculate velocity?
Definition
 velocity = displacement (distance moved in a given direction)/time taken velocity is measured in metres per second (m/s) distance in metres (m) time in seconds (s)NOTE: the abbreviation for seconds is 's' NOT secs!!! Leave sex to the biologists!
Term
 What is displacement?
Definition
 The vector version of distance.It is the distance moved in a particular direction.
Term
 [image] What does this signify?
Definition
 An object that is stationary - the object stays at position 'x' all of the time! gradient = 0 m/s so velocity = 0 m/s
Term
 What would a displacement/time graph indicating a constant velocity look like?
Definition
 [image] The steeper the line the bigger the gradient and therefore the greater the velocity.
Term
 Sketch a displacement/time graph that shows an object moving at decreasing speed
Definition
 [image]
Term
 [image] What does this signify?
Definition
 It moves off at a constant speed and then reverses at a constant speed!The negative gradient indicates it is moving in the opposite direction (moving 'backwards') - so it finishes up where it started!
Term
 Sketch a velocity/time graph to show constant velocity.
Definition
 [image]
Term
 Sketch a velocity/time graph to show a stationary object.
Definition
 [image]
Term
 Sketch a velocity/time graph to show constant acceleration.
Definition
 [image]
Term
 What does the area under a velocity/time graph represent?
Definition
 [image]
Term
 Sketch a graph to show decreasing acceleration.
Definition
 [image]
Term
 What is the equation for acceleration?
Definition
 Change in velocity/time taken velocity is measured in metres per second (m/s) time is measured in seconds (s) acceleration is measured in metres per second squared (m/s2 OR ms-2).
Term
 What is acceleration?
Definition
 Acceleration is a change in velocity. The bigger the change in a given time the higher the acceleration.It takes a force to produce aceleration, so acceleration is evidence that a force is acting.
Term
 What is deceleration?
Definition
 Negative acceleration - it is a decreasing change in velocity.
Term
 What is the abbreviation for acceleration?
Definition
 a (small case!)
Term
 What is the abbreviation for velocity?
Definition
 v (small case).
Term
 What is the abbreviation for time?
Definition
 t (small case)
Term
 What is the abbreviation for distance?
Definition
 d (small case)
Term
 What is the abbreviation for displacement?
Definition
 s (small case) - don;t ask me why - it just is and you need to know that at GCSE and above.
Term
 What is the abbreviation for speed?
Definition
 Please don't abbreviate it to s - just write the word out!
Term
 What is the unit for velocity?
Definition
 velocity is measured in metres per second (m/s)
Term
 What is the unit for acceleration?
Definition
 acceleration is measured in metres per second squared (m/s2 OR ms-2)
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