GCSE Physics
What is the definition of acceleration?
The change in velocity . It has a magnitude and a direction, so it is a vector quantity. Acceleration can be positive or negative and negative acceleration is called deceleration or retardation
What is the definition of velocity?
The speed of something and its direction of travel
Define velocity
This is how fast and in what direction something travels in a straight line an it is measured in m/s or km/h
What is the difference between actual speed and average speed?
actual speed = instantaneous speed, the speed of an object at a given time average speed = the speed averaged over a period of time
How do you calculate acceleration
change in velocity / time taken for change
How do you calculate velocity?
displacement / time taken distance moved in a certain direction / time taken
How do you calculate speed?
distance / time
How do you calculate average speed?
distance travelled / time taken
How do we calculate acceleration?
final velocity - initial velocity / time
What is speed?
how quickly you move from point A to point B
What is the unit used for speed?
m/s
What is velocity measured in?
m/s
What is acceleration measured in
m/s squared
How do we find the gradient?
rise/run
Speed is a _______ quantity
scalar quantity
Define magnitude
size
What is motion?
the process of being moved
What is acceleration?
the rate of change of velocity
What is velocity?
the speed something travels in one, specific direction
Is displacement a scalar or vector quantity?
vector
Velocity is a _________ quantity
vector quantity
What is the difference between speed and velocity?
Speed is how fast you are travelling Velocity is speed in a certain direction
What is the abbreviation for 1. d 2. s 3. t 4. v 5. u 6. a
1. d - distance 2. s - displacement 3. t - time 4. v - velocity/final velocity 5. u - initial velocity 6. a - acceleration
How many meters are in a kilometer?
1000
How many seconds are in an hour?
3600
Define distance
A scalar quantity that refers to how much something has moved
Define displacement
A vector quantity that refers to how far an object has moved from its starting point in a certain direction
Define acceleration
A vector quantity. When an object increases velocity (speeds up), we say that it is accelerating. When an object is slowing down, we say it has negative acceleration, deceleration or retardation.
How do you draw a vector?
As an arrow. The size is represented by the length, the direction is represented by where the arrow points. When we draw them, we must include a reference direction and a scale.
What is the equation for finding average acceleration?
Change in velocity / time taken
Define vector quantities
Have a size (magnitude) and direction
Define scalar quantities
Have a size (magnitude) only
Define speed
How fast something has travelled and it is measured in meters per second or kilometers per hour